Much of the progress in the fields constituting cognitive science has been based upon the use of explicit information processing models, almost exclusively patterned after conventional serial computers. An extension of these ideas to massively parallel, connectionist models appears to offer a number of advantages. After a preliminary discussion, this paper introduces a general connectionist model and considers how it might be used in cognitive science. Among the issues addressed are: stability and noise‐sensitivity, distributed decision‐making, time and sequence problems, and (...) the representation of complex concepts. (shrink)

This paper presents a general computational treatment of how mammals are able to deal with visual objects and environments. The model tries to cover the entire range from behavior and phenomenological experience to detailed neural encodings in crude but computationally plausible reductive steps. The problems addressed include perceptual constancies, eye movements and the stable visual world, object descriptions, perceptual generalizations, and the representation of extrapersonal space.The entire development is based on an action-oriented notion of perception. The observer is assumed to (...) be continuously sampling the ambient light for information of current value. The central problem of vision is taken to be categorizing and locating objects in the environment. The critical step in this process is the linking of visual information to symbolic object descriptions; this is calledindexing, from the analogy of identifying a book from index terms. The system must also identifysituationsand use this knowledge to guide movement and other actions in the environment. The treatment focuses on the different representations of information used in the visual system.The four representational frames capture information in the following forms: retinotopic, head-based, symbolic, and allocentric. The functional roles of the four frames, the communication among them, and their suggested neurophysiological realization constitute the core of the paper. The model is perforce crude, but appears to be consistent with all relevant findings. (shrink)

A theory that treats language not as an abstract symbol system but as a function of our brains and experience, integrating recent findings from biology, ...

The idea that perceptual and cognitive systems must incorporate knowledge about the structure of the environment has become a central dogma of cognitive theory. In a Bayesian context, this idea is often realized in terms of “tuning the prior”—widely assumed to mean adjusting prior probabilities so that they match the frequencies of events in the world. This kind of “ecological” tuning has often been held up as an ideal of inference, in fact defining an “ideal observer.” But widespread as this (...) viewpoint is, it directly contradicts Bayesian philosophy of probability, which views probabilities as degrees of belief rather than relative frequencies, and explicitly denies that they are objective characteristics of the world. Moreover, tuning the prior to observed environmental frequencies is subject to overfitting, meaning in this context overtuning to the environment, which leads (ironically) to poor performance in future encounters with the same environment. Whenever there is uncertainty about the environment—which there almost always is—an agent's prior should be biased away from ecological relative frequencies and toward simpler and more entropic priors. (shrink)

First paper introducing probabilisitic decision theory methods to AI problem solving.

A widespread assumption in the contemporary discussion of probabilistic models of cognition, often attributed to the Bayesian program, is that inference is optimal when the observer's priors match the true priors in the world—the actual “statistics of the environment.” But in fact the idea of a “true” prior plays no role in traditional Bayesian philosophy, which regards probability as a quantification of belief, not an objective characteristic of the world. In this paper I discuss the significance of the traditional Bayesian (...) epistemic view of probability and its mismatch with the more objectivist assumptions about probability that are widely held in contemporary cognitive science. I then introduce a novel mathematical framework, the observer lattice, that aims to clarify this issue while avoiding philosophically tendentious assumptions. The mathematical argument shows that even if we assume that “ground truth” probabilities actually do exist, there is no objective way to tell what they are. Different observers, conditioning on different information, will inevitably have different probability estimates, and there is no general procedure to determine which one is right. The argument sheds light on the use of probabilistic models in cognitive science, and in particular on what exactly it means for the mind to be “tuned” to its environment. (shrink)

: Vasubandhu, an advocate of the idealist Yogācāra school of Buddhism, argues that the nonexistence of external objects can be inferred from the appearance of nonexistent things in perceptual illusion. The idealist view and the argument from illusion are criticized by proponents of the realist Nyāya school on the grounds that illusory experience is parasitic upon veridical experience. The parasitism objection successfully defeats Vasubandhu's argument from illusion but fails to decisively disprove the idealist view because it remains possible that each (...) illusory experience gets its content from a previous illusory experience in an infinite chain. (shrink)

Advances in behavioral and brain sciences have engendered wide ranging efforts to help understand consciousness. The target article suggests that abstract computational models are ill-advised. This commentary broadens the discussion to include mysteries of subjective experience that are inconsistent with current neuroscience. It also discusses progress being made through demystifying specific cases and pursuing evolutionary considerations.

Loin d’être un auteur mineur, thuriféraire d’un naïf “laissez-faire”, Bastiat apparaît comme le précurseur de la plupart des courants libéraux contemporains.Il est frappant de constater que le diagnostic porté par Bastiat sur le fonctionnement de la démocratie demeure d’une brûlante actualité.C’est donc injustement que Hayek a méconnu son devancier : une étude critique de la philosophie juridique et politique du Français lui aurait permis d’éviter quelques inconséquences, telle sa théorie des fonctions non coercitives de l’Etat.Far from being a minor economist, (...) or flattering some naive “laissez-faire”, Bastiat is indeed a precursor of most of the contemporaneous views defending liberalism.It is striking to note how much Bastiat’s diagnosis about the workings of democracy applies with acuity to the current world.Thus, Hayek unduly disregarded his precursor: a critical study of Bastiat’s philosophy and conception of law would have allow Hayek to not fall into some traps, such as his theory on the non-coercitive functions of government. (shrink)

For W. E. B. Du Bois, the tragedy of Reconstruction was that its achievements were overthrown and erased from collective memory. Du Bois’s Black Reconstruction corrects this, claiming enslaved people who fled plantations self-emancipated, thus enacting a “general strike against the slave system.” Yet Du Bois contravenes his general strike thesis when he quotes without rebuttal several Union officials who spoke of the formerly enslaved in degrading, nonagentic terms. I turn to Jacques Rancière’s politics of dissensus to understand why Du (...) Bois quoted such racist views without comment. In Rancière, political actors “stage a scene” of equality that is shared, even among parties in conflict. Recording conflicting perceptions of the strike, highlighting divisions that persist despite momentary advances of equality, Du Bois’s reading of the general strike is dissensual in Rancière’s sense, I argue. But Du Bois also offers a valuable corrective to Rancière, whose account of the first plebeian secession erases a different general strike from memory. Rancière reads the Aventine as an event of confrontation unconnected to the collective action that Du Bois summoned from the archive and named “general strike.”. (shrink)

During the twelfth and thirteenth centuries, great new trends of Jewish thought emerged whose widely varied representatives--Kabbalists, philosophers, and astrologers--each claimed that their particular understanding revealed the actual secret of the Torah. They presented their own readings in a coded fashion that has come to be regarded by many as the very essence of esotericism. Concealment and Revelation takes us on a fascinating journey to the depths of the esoteric imagination. Carefully tracing the rise of esotericism and its function in (...) medieval Jewish thought, Moshe Halbertal's richly detailed historical and cultural analysis gradually builds conceptual-philosophical force to culminate in a masterful phenomenological taxonomy of esotericism and its paradoxes. Among the questions addressed: What are the internal justifications that esoteric traditions provide for their own existence, especially in the Jewish world, in which the spread of knowledge was of great importance? How do esoteric teachings coexist with the revealed tradition, and what is the relationship between the various esoteric teachings that compete with that revealed tradition? Halbertal concludes that, through the medium of the concealed, Jewish thinkers integrated into the heart of the Jewish tradition diverse cultural influences such as Aristotelianism, Neoplatonism, and Hermeticisims. And the creation of an added concealed layer, unregulated and open-ended, became the source of the most daring and radical interpretations of the tradition. (shrink)

Le groupe Féminin Masculin Avenir s’est constitué dès l’automne 1967. Il a participé aux événements de mai 68, devenant alors Féminisme Marxisme Action. Il s’est ensuite dissous dans le Mouvement de libération des femmes lorsque celui-ci a éclaté en 1970.

The group Féminin Masculin Avenir was founded in autumn 1967. It took part in the events of May 68, and subsequently became Féminisme Marxisme Action. It then dissolved into the women¹s liberation movement (MLF) when the latter started in 1970. Le groupe Féminin Masculin Avenir s’est constitué dès l’automne 1967. Il a participé aux événements de mai 68, devenant alors Féminisme Marxisme Action. Il s’est ensuite dissous dans le Mouvement de libération des femmes lorsque celui-ci a éclaté en 1970.

Embodiment, the explicit dependence of cognition on the properties of the human body, is the foundation of contemporary cognitive science. Ballard et al.'s target article makes an important contribution to the embodiment story by suggesting how limitations on neural binding ability lead to deictic strategies for many tasks. It also exploits the powerful experimental method of instrumented virtual reality. This commentary suggests some ways in which the target article might be misinterpreted and offers other cautions.

Critiquer la Déclaration universelle des droits de l’homme du 10 décembre 1948 paraît relever de la provocation ou de l’inconscience. Ses contempteurs, qu’il s’agisse des marxistes ou des conservateurs, se sont déconsidérés. Nonobstant, c’est avec force courage que Hayek s’est attelé dès 1966 à une critique en règle de cette déclaration “constructiviste” dont l’objectif impossible était de fusionner les droits de la tradition libérale avec ceux de la conception marxiste. Le Prix Nobel démontre que les nouveaux droits ainsi proclamés ne (...) peuvent être traduits dans des lois contraignantes sans détruire incontinent l’ordre de liberté auquel tendent les droits “traditionnels” : la Déclaration constitue l’un de ces instruments qui oeuvrent à la dévalorisation du Droit et partant à la destruction de la Liberté. C’est par son prestige et par l’ignorance de ceux qui l’ont exploité que ce texte a pu prospérer. Son seul mérite est de mériter l’oubli.It might seem provocative or inconsistent to criticize the Universal Declaration of Human Rights of December 10, 1948. Its detractors, whether they be Marxists or Conservatives have fallen into discredit. Notwithstanding, Hayek has courageously tried to criticize this “constructivist” piece whose impossible goal was to unite rights in the liberal tradition with those pertaining to the Marxist conception. Hayek shows that the new rights which are proclaimed in this fashion cannot be translated into juridical constraints without destroying forthwith the liberal order cherished by “traditional” rights: the Universal Declaration of Human Rights is one of the tools which enhances the depreciation of Law and, by the way, the annihilation of Freedom. This text has flourished thanks to its prestige and to the ignorance of those who have employed it. Its unique merit is to deserve oblivion. (shrink)