Woods et al. (2015) claim that secular Simple Reaction Time (SRT) slowing (Woodley et al. 2013), disappears once modern studies are corrected for software and hardware lag, and once Galton’s data are corrected for fastest-response selection. Here, this is challenged with a reanalysis of the secular slowing of SRT in the UK amongst large (N>500), population-representative age-matched (≊18-30 years) studies. Starting with Galton’s sample, this is assigned the simulated value estimated by Dodonova and Dodonov (2013, (...) who like Woods et al. were critical of secular SRT slowing, owing to measurement issues) on the basis that he collected the fastest of three trials (207.5ms). The two sexes in Galton’s study are combined (as in Woods et al.), raising the weighted sample mean to 208.5ms. Next is the Wilkinson and Alison (1989) study, which attempted to replicate Galton’s study one century later, collecting SRTs as part of an exhibit in the London Science Museum. An electronic chronoscope recorded SRTs on magnetic tape, and sampled over eight trials with micro-processor-determined variable foreperiods. The mean SRT value for the 1,189 participants aged between 20 and 29 is 245ms. The presence of long and variable foreperiods necessitates a penalty of 10ms (Dodonova & Dodonov, 2013). Another 10ms should be deducted based on key-pressing time (Dodonova & Dodonov, 2013), reducing the mean to 225ms. The studies of Deary and Der (2005) and Der and Deary (2006) are also included. The first utilized the highly representative Scottish Twenty-07 cohort. Dodonova and Dodonov (2013) identified a 53ms lag stemming from liquid crystal stimulus onset delay. This is subtracted from the weighted average of the two sexes (300.8ms), along with another 10ms for key-pressing time. The resultant mean is 237.8ms.Dodonova and Dodonov (2013) cleaned the male data in the Der and Deary (2006) study, collected from the representative UK Health and Lifestyle Survey, by removing cases for which SRT standard deviations exceeded those for choice RT. This reduced the N from 834 to 661, and also reduced the mean from 300ms to 284ms. The estimate was also penalized for LCD onset delay and key-pressing time, reducing the mean to 221ms. When the SRT value for the female sample is penalized equivalently the resulting value is 239ms. In order to simulate the female N for the purposes of taking a weighted average of both sexes, the actual female N is reduced in proportion to the male N (79.3%=881), yielding a weighted mean of 230.9ms for a combined sample-size of 1,472. Table 1 presents the data used in the analysis.Table 1 SRT means, sample sizes and sampling years for four large, age-matched UK samples[Table 1 here]Consistent with Dodonova and Dodonov (2013), N-weighted regression is employed, as the only data on sample variability is sample size. Figure 1 illustrating the secular trend in UK SRT over 100 years.[Figure 1 here] Figure 1. Secular SRT slowing across four large, representative studies from the UK spanning a century. Bubble-size is proportional to sample size. Combined N=6,622. The secular slowing between UK studies is statistically significant (β=0.97; 95% CI=0.969 to 0.971, N=6,622), at –22.8ms a century. Additional evidence for generational SRT slowing comes from Verhaeghen (2014), who suggested that the ratio of longitudinal to cross-sectional age-related slowing might tentatively infer generational changes in processing speed. Verhaeghen reports ratios for two SRT studies (0.91 and 1.15), implying both secular losses and gains. For the study of Deary and Der (2005), the SRT ratios are “censored because they were excessively large” (p. 256). In this study, the ratio of the cross-sectional slowing trend (taking the weighted average of all paired between-cohort differences rescaled in terms of change per decade for males and females), to the weighted average decadal longitudinal slowing trend for both the males and females is 0.73, for an N of 1,926 (cf. Woodley et al., 2014b, for a detailed reanalysis of this dataset). The weighted average of the three SRT ‘Verhaeghen ratios’ is 0.9 (N=4,078) – tentatively consistent with generational declines (i.e. a ratio of <1). In conclusion Woods et al. (2015) have undoubtedly made an important contribution to the debate concerning the role of software and hardware lag in the inflation of contemporary estimates of SRT, however the evidence for generational SRT slowing remains quite compelling. ReferencesDeary, I.J., & Der, G. (2005). Reaction time, age, and cognitive ability: Longitudinal findings from age 16 to 63 years in representative population samples. Aging, Neuropsychology, and Cognition, 12, 187–213.Der, G., & Deary, I.J. (2006). Age and sex differences in reaction time in adulthood: Results from the United Kingdom Health Lifestyle Survey. Psychology and Aging, 21, 62–73.Dodonova, Y.A., & Dodonov, Y.S. (2013). Is there any evidence of historical slowing of reaction time? No, unless we compare apples and oranges. Intelligence, 41, 674–687.Galton, F. (1890). Exhibition of instruments (1) for testing the perception of differences of tint, and (2) for determining reaction-time. Journal of the Anthropological Institute, 19, 27–29.Verhaeghen, P. (2014). The elements of cognitive aging: Meta-analyses of age-related differences in processing speed and their consequences. Oxford: Oxford University Press.Wilkinson, R.T., & Allison, S. (1989). Age and simple reaction time: Decade differences for 5,324 subjects. Journal of Gerontology, 44, 29–35.Woodley, M.A., Madison, G., & Charlton, B.G. (2014b). Possible dysgenic trends insimple visual reaction time performance in the Scottish Twenty-07 cohort: Areanalysis of Deary & Der (2005). Mankind Quarterly, 55, 110-124.Woodley, M.A., te Nijenhuis, J., & Murphy, R. (2013). Were the Victorians cleverer than us? The decline in general intelligence estimated from a meta-analysis of the slowing of simple reaction time. Intelligence, 41, 843–850.Woods, D.L., Wyma, J.M., Yund, E.W., Herron, T.J., & Reed, B. (2015). Factors influencing the latency of simple reaction time. Frontiers in Human Neuroscience, 9:131. (shrink)

The present study investigates procedural learning of motor sequences in children with developmental coordination disorder and/or developmental dyslexia, typically-developing children and healthy adults with a special emphasis on the role of the nature of stimuli and the neuropsychological functions associated to final performance of the sequence. Seventy children and ten adults participated in this study and were separated in five experimental groups: TD, DCD, DD, and DCD + DD children and adults. Procedural learning was assessed with a (...) serial reaction time task that required to tap on a specific key as accurately and quickly as possible when stimuli appeared on the screen. Three types of stimuli were proposed as cues: the classical version of the SRTT with 4 squares aligned horizontally on the screen, giving visuospatial cues, and two modified versions, with 4 letters aligned horizontally on the screen and letters at the center of the screen. Reaction times during the repeated and random blocks allowed assessing three phases of learning: global learning, specific learning and retention of the sequence. Learning was considered as completed when RT evolved significantly in the three phases. Neuropsychological assessment involved, among other functions, memory and attentional functions. Our main result was that learning and retention were not influenced by the available cues in adults whereas learning improved with specific cues in children with or without neurodevelopmental disorders. More precisely, learning was not completed with L cues in children with neurodevelopmental disorders. For children with DD, learning was completed with the VS and VS + L cues whereas for children with DCD, learning was completed with combined VS + L cues. Comorbidity between DD and DCD had no more impact on procedural learning than DCD alone. These results suggest that learning depends on the nature of cues available during practice and that cues allowing learning and retention depend on the type of disorder. Moreover, selective attention was correlated with RT during retention, suggesting that this neuropsychological function is important for procedural learning whatever the available cues. (shrink)

ObjectiveIndividuals with an evening chronotype prefer to sleep later at night, wake up later in the day and perform best later in the day as compared to individuals with morning chronotype. Thus, college students without ADHD symptoms with evening chronotypes show reduced cognitive performance in the morning relative to nighttime. In combination with symptoms presented in attention deficit hyperactivity disorder, we predicted that having evening chronotype renders impairment in attention during the morning, when (...) class='Hi'>students require optimal performance, amplifying desynchrony.MethodFour hundred college students were surveyed for evening chronotype and symptoms of ADHD. Of those surveyed, 43 students with evening chronotype performed laboratory attention tasks and were queried about fatigue during morning and evening sessions.ResultsStudents with ADHD symptoms demonstrated a greater decrement in sustained attentional vigilance when abstaining from stimulants and asked to perform cognitive tests at times misaligned with natural circadian rhythms in arousal compared to their non-ADHD counterparts with the same chronotype. While individuals with ADHD symptoms had slower reaction-times during sustained attention tasks in the morning session compared to those without symptoms, there was no significant group difference in working memory performance, even though both groups made more errors in the morning session compared to the evening session.ConclusionThese findings suggest that evening chronotype students with ADHD symptoms are at a greater disadvantage when having to perform sustained attention tasks at times that are not aligned to their circadian rhythm compared to their neuro-typical peers. The implications of this finding may be useful for the provision of disability accommodations to college age students with ADHD when they are expected to perform tasks requiring sustained attention at times misaligned with their circadian rhythms. (shrink)

Human beings adapt the spontaneous pace of their actions to interact with the environment. Yet, the nature of the mechanism enabling such adaptive behavior remains poorly understood. The aim of the present contribution was to examine the role of attention in motor timing using time series analysis, and a dual task paradigm. In a series of two studies, a finger-tapping task was used in sensorimotor synchronization with various tempi and motor complexity. Time series (...) analyzes indicated that two different timing strategies were used depending on the speed constraints. At slow tempi, tapping sequences were characterized by strong negative autocorrelations, suggesting the implication of cognitive predictive timing. When moving at fast and close-to-spontaneous tempi, tapping sequences were characterized by less negative autocorrelations, suggesting that timing properties emerged from body movement dynamics. The analysis of the dual-task reaction times confirmed that both the temporal and spatial constraints impacted the attentional resources allocated to the finger-tapping tasks. Overall, our work suggests that moving fast and slow involve distinct timing strategies that are characterized by contrasting attentional demands. (shrink)

In this article, we explore the extraction of recursive nested structure in the processing of binary sequences. Our aim was to determine whether humans learn the higher-order regularities of a highly simplified input where only sequential-order information marks the hierarchical structure. To this end, we implemented a sequence generated by the Fibonacci grammar in a serial reaction time task. This deterministic grammar generates aperiodic but self-similar sequences. The combination of these two properties allowed us to evaluate hierarchical (...) learning while controlling for the use of low-level strategies like detecting recurring patterns. The deterministic aspect of the grammar allowed us to predict precisely which points in the sequence should be subject to anticipation. Results showed that participants’ pattern of anticipation could not be accounted for by “flat” statistical learning processes and was consistent with them anticipating upcoming points based on hierarchical assumptions. We also found that participants were sensitive to the structure constituency, suggesting that they organized the signal into embedded constituents. We hypothesized that the participants built this structure by merging recursively deterministic transitions. (shrink)

Comparing the relative sensitivity of direct and indirect measures of learning is proposed as the best way to provide evidence for unconscious learning when both conceptual and operative definitions of awareness are lacking. This approach was first proposed by Reingold & Merikle (1988) in the context of subliminal perception. In this paper, we apply it to a choice reaction time task in which the material is generated based on a probabilistic finite-state grammar (Cleeremans, 1993). We show (1) (...) that participants progressively learn about the statistical structure of the stimulus material over training with the choice reaction time task, and (2) that they can use some of this knowledge to predict the location of the next stimulus in a subsequent “generation” task. However, detailed partial correlational analyses of the correspondence between performance during the reaction time task and the statistical structure of the training material showed that large effects remained even when controlling for explicit knowledge as assessed by the generation task. Hence we conclude (1) that at least some of the knowledge expressed through reaction time performance can not be characterized as conscious, and (2) that even when associations are found at a global level of analysis, dissociations can still be obtained when more detailed analyses are conducted. Finally, we also show that participants are limited in the depth of the contingencies they can learn about, and that these limitations are shared by the Simple Recurrent Network model of Cleeremans & McClelland (1991). (shrink)

Comparing the relative sensitivity of direct and indirect measures of learning is proposed as the best way to provide evidence for unconscious learning when both conceptual and operative definitions of awareness are lacking. This approach was first proposed by Reingold & Merikle (1988) in the context of subliminal perception. In this paper, we apply it to a choice reaction time task in which the material is generated based on a probabilistic finite-state grammar (Cleeremans, 1993). We show (1) (...) that participants progressively learn about the statistical structure of the stimulus material over training with the choice reaction time task, and (2) that they can use some of this knowledge to predict the location of the next stimulus in a subsequent “generation” task. However, detailed partial correlational analyses of the correspondence between performance during the reaction time task and the statistical structure of the training material showed that large effects remained even when controlling for explicit knowledge as assessed by the generation task. Hence we conclude (1) that at least some of the knowledge expressed through reaction time performance can not be characterized as conscious, and (2) that even when associations are found at a global level of analysis, dissociations can still be obtained when more detailed analyses are conducted. Finally, we also show that participants are limited in the depth of the contingencies they can learn about, and that these limitations are shared by the Simple Recurrent Network model of Cleeremans & McClelland (1991). (shrink)

Objective: Basic temporal dysfunctions have been described in patients with schizophrenia, which may impact their ability to connect and synchronize with the outer world. The present study was conducted with the aim to distinguish between interval timing and synchronization difficulties and more generally the spatial-temporal organization disturbances for voluntary actions. A new sensorimotor synchronization task was developed to test these abilities. Method: Twenty-four chronic schizophrenia patients matched with 27 controls performed a spatial-tapping task (...) in which finger taps were to be produced in synchrony with a regular metronome to six visual targets presented around a virtual circle on a tactile screen. Isochronous (time intervals of 500 ms) and non-isochronous auditory sequences (alternated time intervals of 300/600 ms) were presented. The capacity to produce time intervals accurately versus the ability to synchronize own actions (tap) with external events (tone) were measured. Results: Patients with schizophrenia were able to produce the tapping patterns of both isochronous and non-isochronous auditory sequences as accurately as controls producing inter-response intervals close to the expected interval of 500 and 900 ms, respectively. However, the synchronization performances revealed significantly more positive asynchrony means (but similar variances) in the patient group than in the control group for both types of auditory sequences. Conclusion: The patterns of results suggest that patients with schizophrenia are able to perceive and produce both simple and complex sequences of time intervals but are impaired in the ability to synchronize their actions with external events. These findings suggest a specific deficit in predictive timing, which may be at the core of early symptoms previously described in schizophrenia. (shrink)

Auditory feedback perturbation studies have indicated a link between feedback and feedforward mechanisms in speech production when participants compensate for applied shifts. In spectral perturbation studies, speakers with a higher perceptual auditory acuity typically compensate more than individuals with lower acuity. However, the reaction to feedback perturbation is unlikely to be merely a matter of perceptual acuity but also affected by the prediction and production of precise motor action. This interplay between prediction, perception, and motor execution seems (...) to be crucial for the timing of speech and non-speech motor actions. In this study, to examine the relationship between the responses to temporally perturbed auditory feedback and rhythmic abilities, we tested 45 adult speakers on the one hand with a temporal auditory feedback perturbation paradigm, and on the other hand with rhythm perception and production tasks. The perturbation tasks temporally stretched and compressed segments (onset + vowel or vowel + coda) in fluent speech in real-time. This technique sheds light on the temporal representation and the production flexibility of timing mechanisms in fluent speech with respect to the structure of the syllable. The perception tasks contained staircase paradigms capturing duration discrimination abilities and beat-alignment judgments. The rhythm production tasks consisted of finger tapping tasks taken from the BAASTA tapping battery and additional speech tapping tasks. We found that both auditory acuity and motor stability in finger tapping affected responses to temporal auditory feedback perturbation. In general, speakers with higher auditory acuity and higher motor variability compensated more. However, we observed a different weighting of auditory acuity and motor stability dependent on the prosodic structure of the perturbed sequence and the nature of the response as purely online or adaptive. These findings shed light on the interplay of phonological structure with feedback and feedforward integration for timing mechanisms in speech. (shrink)

This paper presents an experimental study investigating artificial grammar learning (AGL) in monolingual and bilingual children, with and without dyslexia, using an original methodology. We administered a serial reaction time (SRT) task, in the form of a modified Simon task, in which the sequence of the stimuli was manipulated according to the rules of a simple Lindenmayer grammar (more specifically, a Fibonacci grammar). By ensuring that the subjects focused on the correct response execution at (...) the motor stage in presence of congruent or incongruent visual stimuli, we could meet the two fundamental criteria for implicit learning: the absence of an intention to learn and the lack of awareness at the level of resulting knowledge. The participants of our studies were four groups of 10-year-old children: 30 Italian monolingual typically developing children, 30 bilingual typically developing children with Italian L2, 24 Italian monolingual dyslexic children and 24 bilingual dyslexic children with Italian L2. Participants were administered the modified Simon task developed according to the rules of the Fibonacci grammar and tested with respect to the implicit learning of three regularities: (i) a red is followed by a blue; (ii) a sequence of two blues is followed by a red and (iii) a blue can be followed either by a red or by a blue. Results clearly support the hypothesis that implicit learning took place, since participants of all groups became increasingly sensitive to the structure of the input, implicitly learning the sequence of the trials and thus appropriately predicting the occurrence of the relevant items, as manifested by faster reaction times in predictable trials. Moreover, group differences were found, with bilinguals being overall faster than monolinguals and dyslexics less accurate than controls. Finally, an advantage of bilingualism in dyslexia was found, with bilingual dyslexics performing consistently better than monolingual dyslexics and, in some conditions, at the level of the two control groups. These results are taken to suggest that bilingualism should be supported also among linguistically impaired individuals. (shrink)

Piéron's Law describes the relationship between stimulus intensity and reaction time. Previously (Stafford & Gurney, 2004), we have shown that Piéron's Law is a necessary consequence of rise-to-threshold decision making and thus will arise from optimal simple decision-making algorithms (e.g., Bogacz, Brown, Moehlis, Holmes, & Cohen, 2006). Here, we manipulate the color saturation of a Stroop stimulus. Our results show that Piéron's Law holds for color intensity and color-naming reaction time, extending the domain (...) of this law, in line with our suggestion of the generality of the processes that can give rise to Piéron's Law. In addition, we find that Stroop condition does not interact with the effect of color saturation; Stroop interference and facilitation remain constant at all levels of color saturation. An analysis demonstrates that this result cannot be accounted for by single-stage decision-making algorithms which combine all the evidence pertaining to a decision into a common metric. This shows that human decision making is not information-optimal and suggests that the generalization of current models of simple perceptual decision making to more complex decisions is not straightforward. (shrink)

IntroductionAlthough the motor signs of Parkinson’s disease are well defined, nonmotor symptoms, including higher-level language deficits, have also been shown to be frequent in patients with PD. In the present study, we used a lexical decision task to find out whether access to the mental lexicon is impaired in patients with PD, and whether task performance is affected by bradykinesia.Materials and MethodsParticipants were 34 nondemented patients with PD, either without medication or under optimum medication. A (...) total of 19 age-matched control volunteers were also recruited. We recorded reaction times to the LDT and a simple RT task. In each task, stimuli were either visual or auditory. Statistical analyses consisted of repeated-measures analyses of variance and Tukey’s HSD post hoc tests.ResultsIn the LDT, participants with PD both off and on medication exhibited intact access to the mental lexicon in both modalities. In the visual modality, patients off medication were just as fast as controls when identifying real words, but slower when identifying pseudowords. In the visual modality of the control task, RTs for pseudowords were significantly longer for PD patients off medication than for controls, revealing an unexpected but significant lexicality effect in patients that was not observed in the auditory modality. Performances of patients on medication did not differ from those of age-matched controls.DiscussionMotor execution was not slowed in patients with PD either off or on medication, in comparison with controls. Regarding lexical access, patients off medication seemed to have difficulty inhibiting a cognitive-linguistic process when it was not required, and exhibit a specific pseudoword processing deficit in the LDT, which may have been related to impaired lateral word inhibition within the mental lexicon. These deficits seemed to be compensated by medication. (shrink)

To investigate whether people can implicitly learn regularities in a social context, we developed a new implicit sequence learning task combining elements from classic false belief and serial reaction time tasks. Participants learned that protagonists were offered flowers at four locations. The protagonists' beliefs concerning the flowers were true or false, depending on their orientation, respectively, toward the scene or away from it. Unbeknown to the participants, there was a fixed belief-related sequence involving three dimensions. Participants had (...) to indicate as fast as possible where the flowers were located, or how many flowers were given according to the protagonists. Experiment 1 combined perceptual and motor processes, whereas Experiment 2 unconfounded the sequence and motor responses, allowing to investigate pure perceptual implicit learning. For reasons of comparison, two non-social conditions were created in Experiment 2 by replacing the protagonists with two non-social objects—colored cameras or shapes. Results revealed significant implicit sequence learning of all belief-related dimensions in Experiment 1, and of true-false belief orientation in Experiment 2, even without a motor confound. Importantly, there were faster reaction times and stronger sequence learning effects in the social than in the non-social conditions. The present findings demonstrate for the first time that people are able to implicitly learn belief-related sequences. (shrink)

A number of ways of taxonomizing human learning have been proposed. We examine the evidence for one such proposal, namely, that there exist independent explicit and implicit learning systems. This combines two further distinctions, (1) between learning that takes place with versus without concurrent awareness, and (2) between learning that involves the encoding of instances (or fragments) versus the induction of abstract rules or hypotheses. Implicit learning is assumed to involve unconscious rule learning. We examine the evidence for implicit (...) learning derived from subliminal learning, conditioning, artificial grammar learning, instrumental learning, and reaction times in sequence learning. We conclude that unconscious learning has not been satisfactorily established in any of these areas. The assumption that learning in some of these tasks (e.g., artificial grammar learning) is predominantly based on rule abstraction is questionable. When subjects cannot report the rules that govern stimulus selection, this is often because their knowledge consists of instances or fragments of the training stimuli rather than rules. In contrast to the distinction between conscious and unconscious learning, the distinction between instance and rule learning is a sound and meaningful way of taxonomizing human learning. We discuss various computational models of these two forms of learning. (shrink)

We argue performance in the serial reaction time task is associated with gradations of awareness that provide examples of fringe consciousness [Mangan, B. . Taking phenomenology seriously: the “fringe” and its implications for cognitive research. Consciousness and Cognition, 2, 89–108, Mangan, B. . The conscious “fringe”: Bringing William James up to date. In B. J. Baars, W. P. Banks & J. B. Newman , Essential sources in the scientific study of consciousness . Cambridge, MA: The MIT (...) Press.], and address limitations of the traditional SRT procedure, including criticism of exclusion generation tasks. Two experiments are conducted with a modified SRT procedure where irrelevant stimulus attributes obscure the sequence rule. Our modified paradigm, which includes a novel exclusion task, makes it easier to demonstrate a previously controversial influence of response stimulus interval on awareness. It also allows identification of participants showing fringe consciousness rather than explicit sequence knowledge, as reflected by dissociations between different awareness measures. The NEO-PI-R variable Openness to Feelings influenced the diversity of subjective feelings reported during two awareness measures, but not the degree of learning and awareness as previously found with traditional SRT tasks [Norman, E., Price, M. C., & Duff, S. C. . Fringe consciousness in sequence learning: the influence of individual differences. Consciousness and Cognition, 15, 723–760.]. This suggests possible distinctions between two components of fringe consciousness. (shrink)

Extracting the regularities of our environment is one of our core cognitive abilities. To study the fine-grained dynamics of the extraction of embedded regularities, a method combining the advantages of the artificial language paradigm and the serial response time task was used with a group of Guinea baboons in a new automatic experimental device. After a series of random trials, monkeys were exposed to language-like patterns. We found that the extraction of embedded patterns positioned at the end (...) of larger patterns was faster than the extraction of initial embedded patterns. This result suggests that there is a learning advantage for the final element of a sequence that benefits from the contextual information provided by previous elements. (shrink)

continent. 2.3 (2012): 218–223 Vijay Prashad. Arab Spring, Libyan Winter . Oakland: AK Press. 2012. 271pp, pbk. $14.95 ISBN-13: 978-1849351126. Nearly a decade ago, I sat in a class entitled, quite simply, “Corporations,” taught by Vijay Prashad at Trinity College. Over the course of the semester, I was amazed at the extent of Prashad’s knowledge, and the complexity and erudition of his style. He has since authored a number of classic books that have gained recognition throughout the world. The (...) Darker Nations , a peoples’ history of the Third World, sent defibrillating shockwaves through an academic world that had almost forgotten the epic scope and historic dignity of the non-aligned movement and post-colonial struggles. In his recent, award-winning work, Arab Spring, Libyan Winter , Prashad delves into his capacious knowledge of the Third World to excavate the discourses and narratives surrounding the upheavals of 2011. “Revolutions have no specific timetable,” states Prashad in the opening line of this exciting and provocative look at contemporary events. Instantly, an atmosphere of suspense emerges. The reader is alerted to the problem of history. Does the making of history then involve a suspension of historical time, or is it a continuous narrative structure into which events must eventually be integrated? Arab Spring, Libyan Winter shows that the answer to the question, “How is history made?” lies just as easily in the asking. The first half of the book works through the events that transpired to bring about the explosive popular uprisings of Arab Spring: Tunisia and Egypt, Yemen and Bahrain. But the events are not put together in a cohesive, chronological fashion. Using an uncommonly gripping style more akin to the folk-story motif of the djeli than to traditionally Orientalist academia, Prashad suspends a given situation, points out its components, and traces back the characters and genealogies that define each link before resuming a narrative. Every moment is an end to itself, and an origin of something different. Thus, the making of history becomes the suspension of its own progress, it’s catastrophic 'stability,' in a process of differentiation through inclusion. Empirically, one might suggest that history is a condition of time, and by extension, of the subject, but history is also an eminent producer of the Subject and her concept of time through memory and narrative. Hence, history is often overdetermined by a dominant narrative of the sovereign. The apparently chaotic composition of Prashad’s historicity is, then, an interstitial morphology of resistance. It illustrates that the time to act for the revolutionary lies in the gaps within the dominant historical realities. It points out the sorties of signifiers constituting nothing in the obliterated ruins of history. Through such illuminations, Arab Spring, Libyan Winter breaks through “the surface of history” to elaborate revolution’s snapping synapses, exploding interruptions and breaches, connecting flows. Messianic Politics It is tempting to think, 'History is either singular, or it is diffuse. It is either one coherent factual narrative, or it is comprised of the aletheia of the multitude.' Yet the reader finds Prashad examining the structure of history on multiple levels. For Prashad, world history is shaped by geographically defined political movements, such as communism or national liberation, with historical agents like the working class for the former and the nationalist militant for the latter. Religion, however, is another matter: “Religion has an unshakable eschatology which a post-utopian secular politics lacks.” Within the telos of religion, there appears on the horizon the image of Benjamin’s thoughts on messianic time—time as “a small fissure in the continuous catastrophe,” a break with history, may contain an ultimate redemption of the human beyond the political power struggle. Succoring the split between geo-political and utopian-religious (messianic) time in the context of Arab Spring, Prashad indicates that the base of “the deep desire and commitment to some form of democracy” is forged by the affinity between eschatological Islamist politics with the People. To think about the Subject of messianic time in the context of the lack of a “coherent timetable” for emancipatory politics, it is perhaps best to return to the modern tradition of Martin Luther King, Jr., whose prefigurative blending of liberation theology and emancipatory politics became most important during his works of 1963, the climactic year of “The Letter from a Birmingham Jail,” the March on Washington, and the bombing of the 16th Street Baptist Church. In “The Letter,” King states the point bluntly: Frankly, I have yet to engage in a direct-action campaign that was “well timed” in view of those who have not suffered unduly from the disease of segregation. For years now I have heard the word “wait!” It rings in the ear of every Negro with piercing familiarity. This “Wait” has almost always meant ‘Never.” We must come to see, with one of our distinguished jurists, that “justice too long delayed is justice denied.” The timing of rebellious action must not be a part of history. It must change history. The kairos appears spontaneous and untimely in its convulsive, shocking presence, yet it is, deeper still, a path, a longue durée , forged through diligent and rigorous praxis. King put a finer point on the path of historic liberation in his declaration in his 1963 speech at Western Michigan University: “[T]ime is neutral.... Somewhere along the way we must see that time will never solve the problem alone but that we must help time. Somewhere we must see that human progress never rolls in on the wheels on inevitability. It comes through the tireless efforts and the persistent work of dedicated individuals who are willing to be co-workers with God. Without this hard work, time itself becomes an ally of the insurgent and primitive forces of irrational emotionalism and social stagnation. We must always help time and realize that the time is always right to do right.” Time, then, exists in “the neutral,” while action must turn to the kairos , not only of taking time, but taking the right time. By turning our relation to time into kairos , we move time from its context within history to a duration between histories—the longue dure?e of Messianic time. The implementation of neutrality in this context suggests a broad space of time to extend through the valley of positive and negative. In Roland Barthes’s lectures from 1978, the neutral takes place in this minimal distance of non-conflict that exists outside of two extremes. It is, in the words of Maurice Blanchot, “the non-general, the non-generic, as well as the non-specific.” For Blanchot, the neutrality of time permeates life as death, impassive and beyond control; such is the neutrality of messianic time, which permeates the charge of history, changing the "I" into the "one." The neutrality of time therefore implicates history in a case against extremism, showing that the work of the radical is not to tend to any particular side, but to have the time to navigate through the terrible terrain of history by altering its course, its patterns and rhythms of movement, connection, sociality. Hence, one does not simply “make history,” one alters the course of history in accordance to “the right time.” The historical path toward emerging power is transmitted as a gesture to the outside of history, against history; a gesture as simple as reaching out. Thus a counterhistory, to use Foucault’s term, is brought forward as the guide of time past a point of no return, a Rubicon, the point where the normal path of history falls to the past. The subject, who must be the only true agent of history, facilitates time through helpfulness, and both the Subject and her history become decentered in relation to one another. Yet history negates the neutrality of time. As Barthes discloses, although the neutral is the “thought and practice of the nonconflictual, it is nevertheless bound to assertion, to conflict, in order to make itself heard.” Engaged with history, time is charged with a destiny, and becomes an opposition. As Prashad insists, “For Arab lands, the events of early 2011 were not the inauguration of a new history, but the continuation of an unfinished struggle that is a hundred years old.” The emergence of the Subject during Arab Spring did not conceive of a new history, but changed the path of history toward a different destiny. “Historical grievances combined with inflationary pressures now met with the subjective sense that victory might be at hand—this was not simply a protest to scream into the wind, but a protest to actually remove autocrats from their positions of authority. The facts of resistance had given way to the expectation of revolutionary change.” The negativity of this charge toward “revolutionary destiny” rendered control, as a positive force, seriously lacking. The lack of control lies in the problem that the Subject is not totally detemporalized or timeless, but untimely in her presence. The Subject is untimely, because her work is visionary, and it is only through such visionary work that the Rubicon can be crossed. Still, the crossing of this border is haunted by anxiety over an impending disaster that lays in wait. It is only through the form of what Benjamin calls divine violence, captivated not with the justice of the means, but the ends—the transformation of history—that a revelation of history’s traumatic foundations can be liberated, and patterns and rhythms of time developed throughout obscured traditions awakened. In this situation, the Subject appears to be outside of right, but setting the state to rights. Because her position is correct, in-so-far as the rebelling subject rebels due to a lack of recognition, her representation appears outside of the norm, which is mistaken as right. Therefore, such visionary work must be carried out through obscured traditions, underground, away from the surveillance of empire. Explaining his method from the start along the lines of Marx’s metaphor of the mole, Prashad insists, “It is the burrowing that is essential, not simply the emergence onto the surface of history.” Arab Spring, Libyan Winter is a book on uncharted networks of time, spread out over the 252 pages like an elaborate spider’s web of passages intertwining with and overwhelming the machinery of the state. Although untimely, Arab Spring was not a flash in the pan, or a Facebook or Twitter revolution. Prashad notes that the government’s suspension of these tools led to further radicalism by furthering communications through face-to-face encounters. In existential terms, Arab Spring might be thought of as a revolution of Being over techne , an uprising of the unchartable, infinite potential of the Other. The name of this Other is found in Chance. The faith of the revolution lies in the proper decentering of the subject, its giving to the Other of time, for only with respect to time does history actually appear on the horizon of the subject, rather than as an imposition. This time of historical agency appears as a moment when anything can happen—a revolutionary truth event where everything comes into question while being realized in its Otherness as a community of the people begins anew in the streets amidst discourse, friendship, reconfigurations of hegemony, and a becoming of a constituent power. Throwing a wrench into the gears of the “cobwebbed tradition” of Orientalism, the decentering of history in Arab Spring, Libyan Winter is a defining quality of its impassioned revolutionary cry. But perhaps the most paradigmatic points of the book emerge from the unexpected voices. To make the connection between the particular manifestations of revolutionary demands to the general historic terms of revolution, Prashad quotes an anonymous young Egyptian in Tahrir Square, who reminds us, “[T]he French Revolution took a very long time so the people could eventually get their rights.” Far from timelessness, the historicization of Arab Spring must exist precisely within the most uncanny appearance of time, as something that does not appear to come from the natural state of time as we know it, but in arriving has completely transformed the way that we understand time. Strange Monsters Revolution is never as simple as a revolt from below against a rusting structure of elites trying to remain in power. As with the French Revolution, Arab Spring consisted of complex familial ties, outside interests, and religious factions fighting alongside, often in awkward juxtaposition to, liberals, working class parties, farmers, and students. It is perhaps because of this historically difficult and incongruous composition that the Arabic word for revolution is thawra , referring to the image of the bull, or thawr , which has religious significance as a pagan deity for the Ancient Semitic tribes and Cartheginians. If Daniel Guérin was correct in saying, “Anarchism and Marxism drink from the same spring,” then it is quite a different oasis that drove the thirsty beast of revolution through what Prashad calls, “the Libyan labyrinth.” Recalling Bataille’s Acéphale, the intestinal labyrinth gains significance as the mode of metabolism and rumination in which, “(the Acephale) has lost himself, loses me with him, and in which I discover myself as him, in other words, as a monster.” Unraveling the discourse of the revolution, the flows of power and hegemony—from Qaddafi’s nationalist coup in 1969 to the wars with Chad from 1978 to 1987, the neoliberal reforms of the 1990s to, finally, the War on Terror—we find that the metabolic process of Libyan Winter ends in the production of oil. In a process of what Prashad calls “involution,” Qaddafi’s bellicose policies, along with his attempts to nationalize Islam together with oil, mutated the source of his power, turning his house against itself. Already a divided nation, with its two major cities on opposite geographic sides of the country, Libya became split between two opposed political powers—liberal reformists and staunch nationalists—as Qaddafi’s political disengagement manifested through what can only be described in psychoanalytic terms as a recursive passage a l’act (mysteriously calling Wikipedia “Kleenex,” declaring that opponents drank hallucinogens with their instant coffee, and so on). Prashad declares, “The mercurial style that Qaddafi adopted was not about his personality alone, but also a leader’s natural response to a system that relied upon power brokers whose own loyalty… did not have any ideological commitment to the system.” As in the case of other nations during Arab Spring, the true expression of revolt was an outward exposition of what had inwardly been happening in microcosmic societies throughout the realm—from indigenous tribes to political parties, for a century, the people, partly motivated by (and in resistance to) economic impositions of development, had been changing the traditional social compositions and participating in what Ruth Wilson Gilmore calls, “the relative autonomy of the movement from the leaders.” It was this empowerment of political reconfigurations taking place under the context of new democratic assemblages that shocked the elites and evoked such a powerful response. Unlike Qaddafi’s awkward policy choices and rants, real acts of power from the West were clear and decisive. Prashad sets the stages of war and diplomacy, far removed from the deserts, mountains, and cities that forged the backdrop of popular politics. Taking place under the now-classic architecture of the “four pillars” of US interests—oil, the War on Terror, Israel, and the circumvention of Iranian hegemony—we find elites rubbing elbows in “Heliopolist cocktail parties and hushed conferences in Kasr al-Ittihadiya” as well as the Concorde-Lafayette hotel in Paris, which provides the setting for a meeting of anti-Qaddafi figures consolidating their power. These scenes are buttressed with the careful portraiture of key historical actors. As Prashad brings the stage of history to life, we find the diplomats and liberals like Frank Wisner, whose career has brought him from Enron in the late 1990s to the Obama Administration, under the aegis of which he was meeting with Mubarak about military support during Arab Spring. We spy the provocateurs, for instance, gauche cavalier , Bernard Henri-Levy, who telephones Sarkozy from Benghazi about the need for more NATO air strikes. We follow the rebel military establishment as it suffers mysterious deaths and even more mysterious assents (like that of apparent CIA cohort, Khalifa Hifter). In each of these intriguing characters, we find different representations of the security state biopolitique: an oil-injected reification that drives Arab Spring from the resentment of rising food prices to the brink of implosion in Libyan Winter. Reminiscent of the scenes of Cold War soirées represented in old Bond films, the aristocratic fight for oil against democracy that was Libyan Winter presents a harsh truth that the new global crisis is simply the continuation of the old history: the global exploitation of capitalism waged against the imagination of the people. As Benjamin laments, “The labyrinth is the right path for the person who always arrives early enough at his destination. This destination is the marketplace.” Yet, “(t)he labyrinth is the habitat of… a humanity (a class) which does not want to know where its destiny is taking it.” Thus, the labyrinth leads, like the desert, only further into itself. As Blanchot explains, “The desert is even less certain than the world; it is never anything but the approach to the desert.” Only the visionary can take time out of the involution toward oblivion. It is here, in this approach to and escape from history, that we find ourselves within Benjamin’s Golgotha, Blanchot’s desert: A space of indeterminate uncertainty where we become familiar only with our own exile. Blanchot writes, “For the moderated and moderate man, the room, the desert, and the world are strictly determined places. For the man of the desert and the labyrinth, devoted to the error of a journey necessarily a little longer than his life, the same space will be truly infinite, even if he knows that it is not, all the more so since he knows it.” The desert, as allegory, provides an eschatology, a mortality in the destiny of Arab Spring. But any allegory of nature might lead to a labyrinthine eschatology (for example, in Bachelard, the forest presents "a limitless world"); the prescience of the untimely is always an uncanny acceptance of the infinite within the finite—the outside of what is understood. Transgenerational and occupied with the image of the future, the untimely makes otherness its home as it proceeds toward liberation. In the work of helping time navigate this dangerous passage of history, Prashad illustrates that the more violent break with history may have occurred in the peaceable struggles of Tahrir Square, and not in the military clashes of Qaddafi with his former Generals who defected to the CIA and NATO countries. It might be possible to suggest, then, that in the case of Tunisia and Egypt, the historical subject of the people was drawn together in a Dionysian dance of different rhythms in the marvelous realm of the ancients, while we fear that the case of Libya suggests an Apollonian future where time, itself, may lay dying under the machinic hand of history. The properly Nietzschean inversion would follow: time is dead, for history has killed it. Yet, if time is dead, struck down in Golgotha, exposed in the desert, mauled by the thawra , it is only in the present sense that it is rendered impossible outside of the context into which the untimely has thrown us. Thus, if history becomes an art of revolution, life as being-towards-death (death as the provocation of the neutrality of time) becomes what Benjamin calls “the allegory of resurrection” through the glorious ruins of history. Prashad ends his work with a rousing finale: “The time of the impossible has presented itself. In Egypt, where the appetite for the possibilities of the future are greatest, the people continue to assert themselves into Tahrir Square and other places, pushing to reinvigorate a Revolution that must not die… For them the slogan is simple: Down with the Present. Long live the Future. May it be so.&rdquo. (shrink)

Anxiety can impair the central executive functioning in working memory (WM). Further, the adverse effect of anxiety on the central executive would be greater when threat-related distractors are present. This study investigated the effect of task-irrelevant emotional faces on WM updating in social anxiety. Forty-one socially anxious (SA) and thirty-nine non-anxious (NA) participants completed an emotional face interference n-back task coupled with eye movement recording. The results showed that, in the 2-back task, SA participants had longer (...) reaction times in the angry-neutral and neutral-neutral interference conditions than in the no-interference condition, whereas NA participants had longer reaction times in the happy-neutral and neutral-neutral interference conditions than in the no-interference condition. In addition, SA participants initially fixated on angry faces more frequently and spent more time looking at them, whereas NA participants initially fixated on happy faces more frequently and spent more time looking at them. This study suggests that attentional bias towards social threats reduces the efficiency rather than effectiveness of WM updating in social anxiety. Moreover, SA individuals are better at resisting interference from task-irrelevant positive stimuli, while NA individuals are better at resisting interference from task-irrelevant threatening stimuli. (shrink)

The purpose of this study is to take preliminary steps to unify psychoacoustic techniques with reaction-time methodologies to address the perceptual mechanisms responsible for the detection of one vs. multiple sounds. We measured auditory redundancy gains for auditory detection of pure tones widely spaced in frequency using the tools of Systems Factorial Technology to evince the system architecture and workload capacity in two different scenarios. We adopted an experimental design in which the presence or absence of a (...) target at each of two frequencies was combined factorially with two stimulus levels. Replicating previous work, results did not allow an assessment of system architecture due to a failure to observe factor influence at the level of distribution ordering for dual-target stimuli for both SOFT and LOUD scenarios. All subjects demonstrated very modest redundancy gains for the dual-target compared to the single-target stimuli, and results were similar for both LOUD and SOFT. We propose that these results can be predicted by a mental architecture that falls into the class of integrated subadditive parallel systems, using a well-supported assumption that reaction time is driven by loudness. We demonstrate that modeled loudness of the experimental sounds is highly correlated with mean reaction time, and we provide a proof-of-concept model based on Steven’s Power law that predicts both a failure of distributional ordering for dual-target stimuli and very modest redundancy gains. (shrink)

Statistical learning (SL) involving sensitivity to distributional regularities in the environment has been suggested to be an important factor in many aspects of cognition, including language. However, the degree to which statistically-learned information is retained over time is not well understood. To establish whether or not learners are able to preserve such regularities over time, we examined performance on an artificial second language learning task both immediately after training and also at a follow-up session 2 weeks later. (...) Participants were exposed to an artificial language (Brocanto2), half of them receiving simplified training items in which only 20% of sequences contained complex structures, whereas the other half were exposed to a training set in which 80% of the items were composed of complex sequences. Overall, participants showed signs of learning at the first session and retention at the second, but the degree of learning was affected by the nature of the training they received. Participants exposed to the simplified input outperformed those in the more complex training condition. A GLMM was used to model the relationship between stimulus properties and participants’ endorsement strategies across both sessions. The results indicate that participants in the complex training condition relied more on an item’s chunk strength than those in the simple training condition. Taken together, this set of findings shows that statistically learned regularities are retained over the course of 2 weeks. The results also demonstrate that training on input featuring simple items leads to improved learning and retention of grammatical regularities. (shrink)

Studies of implicit learning have shown that individuals exposed to a rule-governed environment often learn to exploit 'rules' which describe the structural relationship between environmental events. While some authors have interpreted such demonstrations as evidence for functionally separate implicit learning systems, others have argued that the observed changes in performance result from explicit knowledge which has been inadequately assessed. In this paper we illustrate this issue by considering one commonly used implicit learning task, the Serial reaction time (...) task, and outline what we see as an important problem associated with each of the commonly used methods used to assess explicit knowledge. This is that each measure requires a form of response which is dependent on the subjects having some knowledge of the serial-order of the sequence. We argue that such methods, or more specifically their analyses, seriously underestimate other sources of knowledge, which may be available to subjects during their performance of the SRT task. In support of this argument we demonstrate that subjects' serial-order knowledge can, in principle, be independent of subjects' knowledge of the statistical structure of the sequence, and we propose an alternative method for analysing performance on the Generate task which avoids this problem. (shrink)

Perceptual performance, anticipating opponents' strategies, and judging chess positions especially in subliminal processing is related to expertise level and dependent on chunking processes. It becomes obvious that chess expertise is a multidimensional phenomenon related predominantly to experience. Under consideration of chess expertise categorization, we conducted two priming experiments expanding existing designs by gradually increasing the target and task complexity. The main aim was the evaluation of potential visuocognitive limitations. The results reveal experts' perceptual superiority manifested by their faster (...) class='Hi'>reaction times in settings with increased stimulus and task complexity. Further, experts' priming effects seem to be affected by the target content and/ or priming duration. For short prime duration, experts show priming effects only for less complex prime-target content. Interestingly, for longer prime duration and more complex prime-target content, all participants reveal priming effects. In summary, we argue that experts' visuocognitive processing is rooted in a more efficient visuocognition due to stored chunks of checking and mating constellations. We suggest that visuocognitive limitations are related also to the prime-target complexity as well as to the task. Further investigations must be conducted in order to elucidate the factors with an increased impact on chess players' performance. (shrink)

Four experiments examined how accurately participants can report the times of their own decisions. Within an auditory reaction time task, participants reported the time at which the tone was presented, they decided on the response, or the response key was pressed. Decision time reports were checked for plausibility against the actual RTs, and we compared the effects of experimental manipulations on these two measures to see whether the reported decision times showed appropriate effects. In addition, (...) we estimated the amount of error associated with individual decision time reports by checking how often participants’ decision time reports were implausibly early or late , and by using several quantitative models. Overall, the results suggest that decision time reports are not very accurate but they may be usable for some purposes. (shrink)

Perception of time is susceptible to distortions; among other factors, it has been suggested that the perceived duration of a stimulus is affected by the observer’s expectations. It has been hypothesized that the duration of an oddball stimulus is overestimated because it is unexpected, whereas repeated stimuli have a shorter perceived duration because they are expected. However, recent findings suggest instead that fulfilled expectations about a stimulus elicit an increase in perceived duration, and that the oddball (...) effect occurs because the oddball is a target stimulus, not because it is unexpected. Therefore, it has been suggested that top-down attention is sometimes sufficient to explain this effect, and sometimes only necessary, with an additional contribution from saliency. However, how the expectedness of a target stimulus and its salient features affect its perceived duration is still an open question. In the present study, participants’ expectations about and the saliency of target stimuli were orthogonally manipulated with stimuli presented on a short (Experiment 1) or long (Experiment 2) temporal scale. Four repetitive standard stimuli preceded each target stimulus in a task in which participants judged whether the target was longer or shorter in duration than the standards. Engagement of top-down attention to target stimuli increased their perceived duration to the same extent irrespective of their expectedness. A small but significant additional contribution to this effect from the saliency of target stimuli was dependent on the temporal scale of stimulus presentation. In Experiment 1, saliency only significantly increased perceived duration in the case of expected target stimuli. In contrast, in Experiment 2, saliency exerted a significant effect on the overestimation elicited by unexpected target stimuli, but the contribution of this variable was eliminated in the case of expected target stimuli. These findings point to top-down attention as the primary cognitive mechanism underlying the perceptual extraction and processing of task-relevant information, which may be strongly correlated with perceived duration. Furthermore, the scalar properties of timing were observed, favoring the pacemaker-accumulator model of timing as the underlying timing mechanism. (shrink)

Participants were required to switch among randomly ordered tasks, and instructional cues were used to indicate which task to execute. In Experiments 1 and 2, the participants indicated their readiness for the task switch before they received the target stimulus; thus, each trial was associated with two primary dependent measures: (1) readiness time and (2) target reaction time. Slow readiness responses and instructions emphasizing high readiness were paradoxically accompanied by slow target reaction (...) time. Moreover, the effect of task switching on readiness time was an order of magnitude smaller then the (objectively estimated) duration required for task preparation (Experiment 3). The results strongly suggest that participants have little conscious awareness of their preparedness and challenge commonly accepted assumptions concerning the role of consciousness in cognitive control. (shrink)

The perception of time cannot be reduced to a simple percept produced by an internal clock. The aim of the present study was therefore to investigate the role of the individual consciousness of time on temporal judgments. In the present study, the participants’ awareness of attention-related time distortions was assessed using a metacognitive questionnaire. The participants were also required to verbally judge a series of stimulus durations in a single or a dual task (...) condition. The results revealed that time was underestimated in the dual task compared to the single task. However, the accuracy of time judgments improved in line with the participants’ individual awareness of attentional time distortion: The more aware they were of the role of attention in time perception, the lower the time distortions they exhibited. Conscious awareness of time therefore plays a role in the accuracy of the time judgments made by human beings. (shrink)

Sequential action makes up the bulk of human daily activity, and yet much remains unknown about how people learn such actions. In one motor learning paradigm, the serial reaction time (SRT) task, people are taught a consistent sequence of button presses by cueing them with the next target response. However, the SRT task only records keypress response times to a cued target, and thus it cannot reveal the full time‐course of motion, including predictive movements. (...) This paper describes a mouse movement trajectory SRT task in which the cursor must be moved to a cued location. We replicated keypress SRT results, but also found that predictive movement—before the next cue appears—increased during the experiment. Moreover, trajectory analyses revealed that people developed a centering strategy under uncertainty. In a second experiment, we made prediction explicit, no longer cueing targets. Thus, participants had to explore the response alternatives and learn via reinforcement, receiving rewards and penalties for correct and incorrect actions, respectively. Participants were not told whether the sequence of stimuli was deterministic, nor if it would repeat, nor how long it was. Given the difficulty of the task, it is unsurprising that some learners performed poorly. However, many learners performed remarkably well, and some acquired the full 10‐item sequence within 10 repetitions. Comparing the high‐ and low‐performers’ detailed results in this reinforcement learning (RL) task with the first experiment's cued trajectory SRT task, we found similarities between the two tasks, suggesting that the effects in Experiment 1 are due to predictive, rather than reactive processes. Finally, we found that two standard model‐free reinforcement learning models fit the high‐performing participants, while the four low‐performing participants provide better fit with a simple negative recency bias model. (shrink)