Flickering light induces visual hallucinations in human observers. Despite a long history of the phenomenon, little is known about the dependence of flicker-induced subjective impressions on the flicker frequency. We investigate this question using Ganzfeld stimulation and an experimental paradigm combining a continuous frequency scan with a focus on re-occurring, whole percepts. On the single-subject level, we find a high degree of frequency stability of percepts. To generalize across subjects, we apply two rating systems, a set of complex percept classes (...) derived from subjects’ reports and an enumeration of elementary percept features, and determine distributions of occurrences over flicker frequency. We observe a stronger frequency specificity for complex percept classes than elementary percept features. Comparing the similarity relations among percept categories to those among frequency profiles, we observe that though percepts are preferentially induced by particular frequencies, the frequency does not unambiguously determine the experienced percept. (shrink)

CYBATHLON is an international championship where people with severe physical disabilities compete with the aid of state-of-the-art assistive technology. In one of the disciplines, the BCI Race, tetraplegic pilots compete in a computer game race by controlling an avatar with a brain-computer interface. This competition offers a perfect opportunity for BCI researchers to study long-term training effects in potential end-users, and to evaluate BCI performance in a realistic environment. In this work, we describe the BCI system designed by the team (...) Mirage91 for participation in the CYBATHLON BCI Series 2019, as well as in the CYBATHLON 2020 Global Edition. Furthermore, we present the BCI’s interface with the game and the main methodological strategies, along with a detailed evaluation of its performance over the course of the training period, which lasted 14 months. The developed system was a 4-class BCI relying on task-specific modulations of brain rhythms. We implemented inter-session transfer learning to reduce calibration time, and to reinforce the stability of the brain patterns. Additionally, in order to compensate for potential intra-session shifts in the features’ distribution, normalization parameters were continuously adapted in an unsupervised fashion. Across the aforementioned 14 months, we recorded 26 game-based training sessions. Between the first eight sessions, and the final eight sessions leading up to the CYBATHLON 2020 Global Edition, the runtimes significantly improved from 255 ± 23 s to 225 ± 22 s, respectively. Moreover, we observed a significant increase in the classifier’s accuracy from 46 to 53%, driven by more distinguishable brain patterns. Compared to conventional single session, non-adaptive BCIs, the inter-session transfer learning and unsupervised intra-session adaptation techniques significantly improved the performance. This long-term study demonstrates that regular training helped the pilot to significantly increase the distance between task-specific patterns, which resulted in an improvement of performance, both with respect to class separability in the calibration data, and with respect to the game. Furthermore, it shows that our methodological approaches were beneficial in transferring the performance across sessions, and most importantly to the CYBATHLON competitions. (shrink)

In this book Ludlow uses the metaphysics of time as a case study and focuses on the dispute between A-theorists and B-theorists about the nature of time.

The essays in this volume address three fundamental questions in the philosophy of science: What is required for some fact to be evidence for a scientific ...

Many technology ethicists hold that the time has come to articulate _neurorights_: our normative claims vis-à-vis our brains and minds. One such claim is the right to _mental integrity_ (‘MI’). I begin by considering some paradigmatic threats to MI (§1) and how the dominant autonomy-based conception (‘ABC’) of MI attempts to make sense of them (§2). I next consider the objection that the ABC is _overbroad_ in its understanding of what threatens MI and suggest a friendly revision to the ABC (...) that addresses the objection (§3). I then consider a second objection: that the ABC cannot make sense of the MI of the _non-autonomous_. This objection appears fatal even to the revised ABC (§4). On that basis, I develop an alternative conception on which MI is grounded in a plurality of simpler capacities, namely, those for _affect_, _cognition_, and _volition_. Each of these more basic capacities grounds a set of fundamental interests, and they are for that reason worthy of protection even when they do not rise to the level of complexity necessary for autonomy (§5). This yields a fully general theory of MI that accounts for its manifestations in both the autonomous and the non-autonomous. (shrink)

The expansion of research on deep brain stimulation (DBS) and adaptive DBS (aDBS) raises important neuroethics and policy questions related to data sharing. However, there has been little empirical research on the perspectives of experts developing these technologies. We conducted semi-structured, open-ended interviews with aDBS researchers regarding their data sharing practices and their perspectives on ethical and policy issues related to sharing. Researchers expressed support for and a commitment to sharing, with most saying that they were either sharing their data (...) or would share in the future and that doing so was important for advancing the field. However, those who are sharing reported a variety of sharing partners, suggesting heterogeneity in sharing practices and lack of the broad sharing that would reflect principles of open science. Researchers described several concerns and barriers related to sharing, including privacy and confidentiality, the usability of shared data by others, ownership and control of data (including potential commercialization), and limited resources for sharing. They also suggested potential solutions to these challenges, including additional safeguards to address privacy issues, standardization and transparency in analysis to address issues of data usability, professional norms and heightened cooperation to address issues of ownership and control, and streamlining of data transmission to address resource limitations. Researchers also offered a range of views on the sensitivity of neural activity data (NAD) and data related to mental health in the context of sharing. These findings are an important input to deliberations by researchers, policymakers, neuroethicists, and other stakeholders as they navigate ethics and policy questions related to aDBS research. (shrink)

An introduction to the life and work of the philosopher Jacques Derrida.

Drawing comparisons with other art forms, this book examines the role of aesthetic features in silent reading, such as narrative structure, and the core experience of reading a novel as a story rather than a scholarly exercise. Focuses on the experience of the art form known as the novel Uses the more common perspective of a reader who reads to be told a story, rather than for scholarly or critical analysis Draws comparisons with experience of the other arts, music in (...) particular Explores the different effects of a range of narrative approaches. (shrink)

Vanderschraaf develops a new theory of game theory equilibrium selection in this book. The new theory defends general correlated equilibrium concepts and suggests a new analysis of convention.

Adamson and Ganeri present a lively introduction to one of the world's richest intellectual traditions: the philosophy of classical India. They guide us through such famous works as the Vedas and the Upaniṣads, and tell the stories of how Buddhism and Jainism developed. Anyone curious about South Asian philosophy can start here.

An intellectual biography of Max Weber which uses his most famous work, The Protestant Ethic and the Spirit of Capitalism as its starting point, with wider reference to the social, political, and religious thought of the time.

Die Buchreihe Konzepte der Sprach- und Literaturwissenschaft gibt Aufschluss ber Prinzipien, Probleme und Verfahrensweisen philologischer Forschung im weitesten Sinne und dient einer Bestimmung des Standorts der Linguistik und Literaturwissenschaft. Die Reihe bergreift Einzelsprachen und Einzelliteraturen. Sie stellt sich in den Dienst der Reflexion und Grundlegung einer allgemeinen Sprach- und Literaturwissenschaft. Die B nde sind zum Teil informierende Einf hrungen, zum Teil wissenschaftliche Diskussionsbeitr ge.

Notices Amer. Math. Sac. 51, 2004). Logically, such a "Grothendieck topos" is something like a universe of continuously variable sets. Before long, however, F.W. Lawvere and M. Tierney provided an elementary axiomatization..