According to conventional wisdom, the split-brain syndrome puts paid to the thesis that consciousness is necessarily unified. The aim of this paper is to challenge that view. I argue both that disunity models of the split-brain are highly problematic, and that there is much to recommend a model of the split-brain—the switch model—according to which split-brain patients retain a fully unified consciousness at all times. Although the task of examining the unity of consciousness through the lens of the split-brain syndrome (...) is not a new one—such projects date back to Nagel’s seminal paper on the topic—the time is ripe for a re-evaluation of the issues. (shrink)

Several theories claim that dreaming is a random by-product of REM sleep physiology and that it does not serve any natural function. Phenomenal dream content, however, is not as disorganized as such views imply. The form and content of dreams is not random but organized and selective: during dreaming, the brain constructs a complex model of the world in which certain types of elements, when compared to waking life, are underrepresented whereas others are over represented. Furthermore, dream content is consistently (...) and powerfully modulated by certain types of waking experiences. On the basis of this evidence, I put forward the hypothesis that the biological function of dreaming is to simulate threatening events, and to rehearse threat perception and threat avoidance. To evaluate this hypothesis, we need to consider the original evolutionary context of dreaming and the possible traces it has left in the dream content of the present human population. In the ancestral environment human life was short and full of threats. Any behavioral advantage in dealing with highly dangerous events would have increased the probability of reproductive success. A dream-production mechanism that tends to select threatening waking events and simulate them over and over again in various combinations would have been valuable for the development and maintenance of threat-avoidance skills. Empirical evidence from normative dream content, children's dreams, recurrent dreams, nightmares, post traumatic dreams, and the dreams of hunter-gatherers indicates that our dream-production mechanisms are in fact specialized in the simulation of threatening events, and thus provides support to the threat simulation hypothesis of the function of dreaming. Key Words: dream content; dream function; evolution of consciousness; evolutionary psychology; fear; implicit learning; nightmares; rehearsal; REM; sleep; threat perception. (shrink)

The Urgent Need for an Intellectual Revolution For much of my working life (from 1972 onwards) I have argued, in and out of print, that we need to bring about a revolution in the aims and methods of science – and of academic inquiry more generally. Instead of giving priority to the search for knowledge, academia needs to devote itself to seeking and promoting wisdom by rational means, wisdom being the capacity to realize what is of value in life, for (...) oneself and others, wisdom thus including knowledge, understanding and technological know-how, but much else besides. A basic task ought to be to help humanity learn how to create a better world. (shrink)

Voluntary acts are preceded by electrophysiological (RPs). With spontaneous acts involving no preplanning, the main negative RP shift begins at about200 ms. Control experiments, in which a skin stimulus was timed (S), helped evaluate each subject's error in reporting the clock times for awareness of any perceived event.

In this paper I argue that neuroscience has been harmed by the widespread adoption of seriously inadequate methodologies or philosophies of science - most notably inductivism and falsificationism. I argue that neuroscience, in seeking to understand the human brain and mind, needs to follow in the footsteps of evolution.

1. The Urgent Need for an Intellectual Revolution 2. Two Fundamental Problems 3. Autobiographical Remarks 4. What Kind of Inquiry Can Best Help Life of Value to Flourish? 5. How is Life of Value Possible in the Physical Universe? 6. Connections between the Two Problems .

Most readers will agree with the starting assumptions of Klee that contemporary science and philosophy assume a primarily micro-deterministic view of nature–and that this has long been the case, or was at least until the 1970s. Defending a strict micro-determinism, Klee argues that concepts of emergence that seemingly are opposed to micro-determinist doctrine can be shown, on analysis, to be ultimately consistent with a thoroughgoing philosophy of micro-determinism. An exception is made, however, in the case of my own view, labeled (...) “direct macro-determinism,” which he describes as “ultimately more troublesome” but then disposes of as being based on “simplistic analogies” and “metaphors” and “too weak to be conclusive.”. (shrink)

SummaryThis paper explicates a Constructivist Epistemology which underlies cybernetic models of perceiving and knowing. We focus on the recent work of W. T. Powers . Powers' model consists of hierarchially arranged negative feedback systems, is based on the claim that living organisms behave to control perceptions, and thus suggests that organisms construct their experiential world. We argue that this provides a basis for a modified scientific scepticism, a scepticism with a positive dimension gained by adding the notion of cognitive construction. (...) From this perspective, knowing and perceiving pertain to the construction of invariances in the living organism's experience.RésuméDans cet essai, nous exposons une épistémologie constructivistc qui sert de base pour des modèles cybernétiques de la perception et de la connaissancc. Nous nous référonts à l'œuvre de W. T. Powers qui a propose un modèle constitué par un arrangement hiérarchique de boucles rétroactives en partant de l'idée que tout comportement a pour but de contrôler les perceptions. Ce modèle suggère que le monde expérientiel est le produit d'une activité constructive. Nous défendons la thèse que cette orientation peut fournir le fondement d'un scepticisme scientifique qui acquiert un aspect positif par la notion de construction cognitive. De ce point de vue, connaissance et perception sont des activités qui construisent des invariances dans l'expérience d'un organisme.ZusammenfassungIn der vorliegenden Arbeit wird eine konstruktivistische Erkenntnistheorie entwickelt, die ihrerseits gewissen kybernetischen Modeller) der Wahrnehmurtg und Er‐kenntnis zugrundeliegt. Wir beziehen uns auf die Untersuchungen von W. T. Powers , dessen Modell aus hierarchisch angeordneten Rückkopplungssystemen besteht und auf der Annahme be‐ruht, dass das Verhalten von Lebewesen der Regelung von Wahrnehmungcn dicnt. Powers legt deshalb die Hypothese nahe, dass Organismen ihre Erlebenswelt konstru‐iren. Wir vertreten die Ansicht, dass diese die Grundlage für einen neuen wisscnschaftli‐chen Skeptizismus liefert, der auf Grund des Begriffes der kognitiven Konstruktion eine positive Dimension gewinnt. Von diesem Gesichtspunkt aus betrachtet betreffen Wissen und Wahrnehmung den aktiven Aufbau von Konstanten in der Erlebenswelt des Orga‐nismus. (shrink)