Common ancestry is a central feature of the theory of evolution, yet it is not clear what “common ancestry” actually means; nor is it clear how it is related to other terms such as “the Tree of Life” and “the last universal common ancestor”. I argue these terms describe three distinct hypotheses ordered in a logical way: that there is a Tree of Life is a claim about the pattern of evolutionary history, that there is a last universal common ancestor (...) is an ontological claim about the existence of an entity of a specific kind, and that there is universal common ancestry is a claim about a causal pattern in the history of life. With these generalizations in mind, I argue that the existence of a Tree of Life entails a last universal common ancestor, which would entail universal common ancestry, but neither of the converse entailments hold. This allows us to make sense of the debates surrounding the Tree, as well as our lack of knowledge about the last universal common ancestor, while still maintaining the uncontroversial truth of universal common ancestry. (shrink)

El martes 26 de abril de 2016 en la Universidad Pontificia Bolivariana de Medellín, en el curso “De la analítica a los acto de habla” del Doctorado en Filosofía, tuvimos la oportunidad de compartir y hacer una conversatorio con el filósofo mexicano Dr. Alejandro Tomasini Bassols, investigador del Instituto de Investigaciones Filosóficas y profesor de filosofía en la Facultad de Filosofía y Letras de la UNAM. El profesor Tomasini es uno de los investigadores más reconocidos en la obra del Filósofo (...) austriaco Ludwig Wittgenstein, además de haber desarrollado una importante obra alrededor de la tradición analítica y de algunos problemas actuales como la discusión sobre la pena capital. También el profesor Tomasini en su visita a Colombia, inicialmente participó en Medellín con una conferencia titulada “Derecho y objetividad”, en la Universidad Pontificia Bolivariana y luego en la Feria del Libro de Bogotá –FILBO- realizó la presentación y conferencia del libro Hacer mundos: el nombrar y la significatividad. Previo a su viaje a Bogotá, interactuó con el curso doctoral en filosofía y de este encuentro académico presentamos el siguiente diálogo. (shrink)

A phylogeny that allows for lateral gene transfer (LGT) can be thought of as a strictly branching tree (all of whose branches are vertical) to which lateral branches have been added. Given that the goal of phylogenetics is to depict evolutionary history, we should look for the best supported phylogenetic network and not restrict ourselves to considering trees. However, the obvious extensions of popular tree-based methods such as maximum parsimony and maximum likelihood face a serious problem—if we judge networks by (...) fit to data alone, networks that have lateral branches will always fit the data at least as well as any network that restricts itself to vertical branches. This is analogous to the well-studied problem of overfitting data in the curve-fitting problem. Analogous problems often have analogous solutions and we propose to treat network inference as a case of model selection and use the Akaike Information Criterion (AIC). Strictly tree-like networks are more parsimonious than those that postulate lateral as well as vertical branches. This leads to the conclusion that we should not always infer LGT events whenever it would improve our fit-to-data, but should do so only when the improved fit is larger than the penalty for adding extra lateral branches. (shrink)

La muerte resulta problemática para la contemporaneidad. El existencialismo es una corriente filosófica que presenta la facticidad de la mortalidad como propia de la vida. El pensador Albert Camus articula los pilares fundamentales de su filosofía en torno a la experiencia de la muerte, que lleva al absurdo, del que debe partir la acción rebelde. En esta investigación se analizan algunas dinámicas que, pretendiendo huir de la muerte, solo han conseguido hacernos débiles frente a ella. Presentaremos a Sísifo y Rieux, (...) dos de los personajes de sus escritos, como aquellos paradigmas de conducta que pueden contribuir a hacernos más conscientes del absurdo y poder, de este modo, vivir, amar y luchar. (shrink)

A common view is that species occupy a unique position on the Tree of Life. Evaluating this claim requires an understanding of what the Tree of Life represents. The Tree represents history, but there are at least three biological levels that are often said to have genealogies: species, organisms, and genes. Here I focus on defending the plausibility of a gene-based account of the Tree. This leads to an account of species that are determined by gene genealogies. On this view, (...) an exclusive group is a group of organisms that forms a clade for a higher proportion of the genome than any conflicting clade. Taxa occupy a unique position in what can be called the ‘primary concordance tree’. But each gene has its own historical ‘Tree of Life’. I conclude by arguing that both organismal pedigrees with their corresponding Tree as well as gene genealogies and their trees are objectively real and play important, but different, roles in biological practice. (shrink)

The present paper explores the phenomenology of disorientation and its relationship with self-consciousness. Section 1 discusses previous literature on the links between self-location and self-consciousness and proposes a distinction between minimal self-location and integrated self-location. The double aim of the paper is to use this distinction to deepen our understanding of spatial disorientation, and to use the phenomenology of disorientation to elucidate the role that integrated self-location plays in shaping self-consciousness. Section 2 starts by looking at the experience of being (...) “turned around”, which is a common experience of disorientation. This analysis leads to the conclusion that integrated self-location is transmodal and depends on all three egocentric axes, and that disorientation destabilizes this integrated self-location. Section 3 explores a corpus of reports of disorientation episodes and highlights four key characteristics of these experiences and their links to self-consciousness, focusing on the transformations in both the lived body and the experience of space. The central thesis of this paper is that during disorientation a destabilization of integrated self-location results in a diminished form of self-consciousness. (shrink)

Bayesian methods have become among the most popular methods in phylogenetics, but theoretical opposition to this methodology remains. After providing an introduction to Bayesian theory in this context, I attempt to tackle the problem mentioned most often in the literature: the “problem of the priors”—how to assign prior probabilities to tree hypotheses. I first argue that a recent objection—that an appropriate assignment of priors is impossible—is based on a misunderstanding of what ignorance and bias are. I then consider different methods (...) of assigning prior probabilities to trees. I argue that priors need to be derived from an understanding of how distinct taxa have evolved and that the appropriate evolutionary model is captured by the Yule birth–death process. This process leads to a well-known statistical distribution over trees. Though further modifications may be necessary to model more complex aspects of the branching process, they must be modifications to parameters in an underlying Yule model. Ignoring these Yule priors commits a fallacy leading to mistaken inferences both about the trees themselves and about macroevolutionary processes more generally. (shrink)

This paper aims to offer an account of affective experiences within Predictive Processing, a novel framework that considers the brain to be a dynamical, hierarchical, Bayesian hypothesis-testing mechanism. We begin by outlining a set of common features of affective experiences that a PP-theory should aim to explain: feelings are conscious, they have valence, they motivate behaviour, and they are intentional states with particular and formal objects. We then review existing theories of affective experiences within Predictive Processing and delineate two families (...) of theories: Interoceptive Inference Theories and Error Dynamics Theories. We highlight the strengths and shortcomings of each family of theories and develop a synthesis: the Affective Inference Theory. Affective Inference Theory claims that valence corresponds to the expected rate of prediction error reduction. In turn, the particular object of a feeling is the object predicted to be the most likely cause of expected changes in prediction error rate, and the formal object of a feeling is a predictive model of the expected changes in prediction error rate caused by a given particular object. Finally, our theory shows how affective experiences bias action selection, directing the organism towards allostasis and towards optimal levels of uncertainty in order to minimise prediction error over time. (shrink)

This paper investigates ontological dimensions of the blockchain by asking what kind of socio-technical object bitcoin is. It discusses both blockchain's political qualities and the political forms enabled by its emergence. It first observes recent approaches to the ontology of money and the political qualities of the ledgers used by the current fractional reserve banking model. It then directs the same questions at blockchain technology. The paper discusses an ontology proposed by Ole Bjerg and argues in favour of a mixed-ontology (...) approach to blockchains. It then questions the political qualities of the distributed ledger as a digital object and highlights the apparent absence of authority figures in the model. Finally, it argues that the political ontology of the blockchain can be framed as the displacement of authority from institutional actors into instrumental control of trust, in a dynamically distributed environment. (shrink)

There is a remarkable gap in the academic literature when it comes to group navigation, and procedural metacognition in group navigation is an important but virtually unexplored topic. The present paper aims to fill this gap by providing an account of how metacognitive feelings evaluate and regulate group navigational processes. The paper reviews animal studies and ethnographic work to elucidate three exiting processes in human group navigation: many-wrongs, leadership and emergent sensing. This is followed by an analysis of the role (...) of procedural metacognition in the navigational processes involved in each of these three processes. This analysis shows that procedural metacognition serves to regulate and evaluate group navigation in a flexible, process-specific way. When performance issues arise during group navigation, the emergence of negative affective states makes the navigational process conspicuous, prompting a modulation of said process. (shrink)

Nota crítica a propósito de: LENDE, Daniel H. y GREG, Downey (editores), The Encultured Brain. An Introduction to Neuroanthropology , Cambridge, Massachusetts Institute of Technology, 2012.

La cultura griega, al mismo tiempo que la filosofía platónica, ha contemplado la inmortalidad del alma como algo cierto. Por su parte, el pensamiento de Unamuno se encuentra articulado poru anhelo de inmortalidad. En el pensamiento unamuniano se ofrecen diversas vías que buscan solucionar este problema antropológico fundamental. La falta de éxito en esta empresa nos aboca al tragicismo, que se convierte en un posicionamiento filosófico, cuya conceptualización filosófica encontramos en la obra Del sentimiento trágico de la vida. anto Platón (...) como Unamuno acaban realizando un giro desde el logos al mito o la religión, a fin de abordar temáticas que la racionalidad no puede solucionar. ¿Es posible que ambos pensadores se encuentren en su concepción de la inmortalidad del alma? Perseguimos la tesis de que el amor es el punto de encuentro entre ambos pensamientos, entendido este como una vía de «inmortalización» del alma. En esta investigación intentaremos poner en contacto ambos pensamientos, así como identificar algún posible elemento platónico en la filosofía del bilbaíno. (shrink)

Drosophila flies began to be used in the study of species evolution during the late 1930s. The geneticists Natasha Sivertzeva-Dobzhansky and Elizabeth Reed pioneered this work in the United States, and María Monclús conducted similar studies in Spain. The research they carried out with their husbands enabled Drosophila population genetics to take off and reveals a genealogy of women geneticists grounded in mutual inspiration. Their work also shows that women were present in population genetics from the beginning, although their contributions (...) have previously remained unacknowledged. The similarities between their research biographies also illustrate their position in a genealogy of partnerships working on Drosophila genetics. (shrink)

Despite the enormous importance and widespread use of the term, it is unclear exactly what a phylogeny represents. It is important to define phylogeny precisely since other central terms like “clade” and “monophyletic” are often defined relative to phylogenetic trees and on some views in taxonomy, taxa must be clades. Edwards presents the common picture in contemporary systematics as depending on the existence of a “species tree” in which phylogeny “records the branching pattern of evolving lineages through time”. But what, (...) precisely, does this mean? (shrink)

La migración internacional nos enfrenta con problemas irresolubles desde la figura moderna del Estado nacional, su concepto de ciudadanía y su noción de justicia. Juan Carlos Velasco critica las limitaciones y la orientación de las políticas contemporáneas que nos hacen percibir a la migración como una “invasión”, y propone un modo radicalmente diferente de entender e intervenir el fenómeno desde lo trasnacional. Nacer de uno u otro lado de una línea divisoria es un evento azaroso, no obstante delimitar la (...) frontera es una construcción histórico-política: la desigualdad en las oportunidades que ofrecen las naciones es una situación estructural de injusticia que se perpetúa con las políticas de exclusión de los migrantes y la deslegitimación de su derecho a buscar una vida mejor. Esa circunstancia genera fracturas sociales, injustificables pero normalizadas, que imposibilitan alcanzar la justicia global. Velasco presenta un análisis completo que abarca las dimensiones política, jurídica y moral del tema, en el que lleva a la filosofía política a un terreno práctico del que se desprenden las claves para entender y actuar en esta nueva era en la que, debido a los conflictos sociales y políticos, la migración vuelve a ser argumento de discusión relevante. (Texto de la CONTRAPORTADA del libro). (shrink)

This paper introduces the hypothesis that boredom may be a decisive factor in the social outbreak that took place in Chile in 2019. It is based on another hypothesis that postulates that boredom can become a political emotion capable of unleashing a revolution when it affects an entire community. The main objective of the work is to explain the theoretical, philosophical framework in which the second hypothesis is inscribed and to give reasons why, if this is true, it could be (...) applied to the specific case of Chile. In this sense, an unpublished definition of the concept of boredom is first outlined and the literature that describes boredom as a reactive and political emotion is examined. Then, the Chilean socio-political context of the last forty years is analyzed in search of isolatable factors that may be related to the experience of boredom. Lastly, an original line of research is proposed on which to work to test both hypotheses in a broader project that aims to be able to predict when a social system is on the verge of collapse because of boredom. (shrink)

In this article there is a criticism of the thesis that defines the Spanish political transition as a successful attempt to put an end to the "law of the pendulum" that had been governing our constitutional history. On the one hand, this thesis underestimates the conditions of the Spanish situation of 1978, marked by the transit between two worlds, the modern one that inherited and the emerging postmodern, which would become an unquestionable reality from 1989. In addition, the Spanish Constitution (...) of 1978 was drafted at a time when the political-normative conceptual assumptions of the dominant constitutional paradigm in Europe after World War II were declining. Likewise, the thesis ignores the specific spanish differential feature: the civil war of 1936-1939 and the subsequent rupture and radical separation of Spanish modernity into two distinct historical sections: one initiated with the French Revolution and culminated in the most absolute destruction of the pre-existing political and social order; and another that starts in 1939, since the construction of zero of a radically new pattern of society and culture, with which the Spaniards encountered in December 1975 when they assumed their full political protagonism in a situation unprecedented and completely devoid of precedents in our national constitutional tradition. (shrink)

Resumen En este artículo se examina el Darwinismo Neural en su explicación de la evolución de la conciencia humana, contrastando su metodología con la utilizada por Richard Lewontin, Richard Levins y Steven Rose, quienes han hecho importantes aportaciones en el estudio de los sistemas vivos desde un punto de vista dialéctico. Concluimos que la explicación interaccionista de la evolución de la conciencia planteada en el DN, supera muchas de las deficiencias del determinismo biológico; sin embargo, al compartir algunos lineamientos con (...) el cartesianismo, mantiene un carácter a-histórico insuficiente para la explicación de la conciencia humana. Finalmente, proponemos la adopción de una teoría explicativa de la conciencia humana que considere las relaciones existentes en ella, no sólo como interacciones sino también como interpenetraciones ontogénicas y filogenéticas.This article examines Neural Darwinism proposed as an explanation of evolution of human consciousness. His methodology is contrasted with that used by Richard Lewontin, Richard Levins, and Steven Rose, who made important contributions to the study of living systems from a dialectical point of view. We conclude that the interactionist explanation of the evolution of conscience put forward in ND overcomes many of the deficiencies proper to biological determinism. However, as ND also shares many of the foundations of the Cartesian approach, it maintains a non-historical character, insufficient for the account of human consciousness. We suggest the adoption of an alternative theory, able to fully explain human conscience which must consider the whole of existing relations in it, and, instead of merely considering them as interactions, they have to be observed as dialectical interpenetrations. (shrink)

: This article presents a definition of action that links empirical facts with normative reasons to form an explanation of rational agency with predictive capabilities. This idea is developed along the lines of pragmatism which holds that a set of beliefs is a matter of linguistic evaluation from a particular community. This notion is related to the idea of facts as empirical information that is cognitively apprehended. Such information is regarded as an input which is later contrasted to expected behavioral (...) responses from the agent. The deviation of such observed behavior with respect to the expected one represents an evaluative output that is understood as the definition of reasonably expected behavior. Action is, thus, understood as the outcome of such an evaluative process. (shrink)

Common ancestry is one of the pillars of Darwin’s theory of evolution. Today, the Tree of Life, which represents how all life is genealogically related, is often thought of as an essential component in the foundations of biological systematics and so therefore of evolutionary theory – and perhaps all of biology itself. It is an iconic representation in biology and even penetrates into popular culture.

A reassessment of the political and religious aspects of Philip of Spain’s reign in England and of the kingdom’s integration into the Spanish Monarchy.