This work is a study of the place of conscious experience in the natural order. In the first part, I examine the prospects for a reductive explanation of consciousness of the kind that has proved successful for other natural phenomena. I develop a systematic framework centered on the notion of supervenience for dealing with the metaphysical and explanatory issues involved, and apply this framework to consciousness. I give a number of arguments to the conclusion that consciousness is not logically supervenient (...) on the physical, and therefore cannot be reductively explained. I illustrate this with a critique of potential explanations using the methods of cognitive modeling, neuroscience, and evolutionary biology. I further argue for a form of dualism, on which consciousness is seen as a non-physical property that supervenes on the physical by a lawful connection. In the second part, I move toward a positive theory of consciousness, focusing on the nature of the laws that connect consciousness and the physical. I deal at length with the relation between consciousness and judgments about consciousness; this provides a nexus between consciousness and cognition that can be exploited to strongly constrain a theory. In addition, I provide and analyze thought-experiments in arguing for the conclusion that any two systems with the same abstract functional organization will have the same conscious experience, and so arguing against what have been called the "absent qualia" and "inverted qualia" hypotheses. Finally, I briefly outline some further work: a double-aspect theory of consciousness based on the notion of information, an investigation of the relationship between computation and consciousness, and an application to some problems in quantum mechanics. (shrink)

Emergentists such as Samuel Alexander and C. Lloyd Morgan held that the mental is causally efficacious, supervenes on the physical, but does so mysteriously. We must accept the emergent mind, in Alexander's phrase, with "natural piety". Emergentism emerged late last century and all but disappeared in the twentieth. This dissertation attempts to revive the position. ;To explain psycho-physical supervenience is to provide a proof of the mental facts from the physical facts, such that mental vocabulary only occurs in the proof (...) in the form of a priori bridge principles connecting mental goings on with the physical facts. Offering a proof of the mental facts from the physical facts would be one way to justify supervenience, thus simultaneously vindicating and explaining it. ;Those philosophers who try to "naturalize intentionality" can be seen as seeking such proofs for intentional states. Various theories of this kind are considered: those of Fodor, Millikan, Lewis, and others. It is argued in chapters 2 and 3 that these theories are either false or unknowable. ;The case for eliminativism is examined in chapter 4, where it is argued that eliminativism is, of necessity, not a rational thesis to adopt. ;A view found in the writings of Davidson and Dennett is the topic of chapter 5. This is a kind of third-person Cartesianism: a person's mind is completely revealed by the deliverances of a suitably equipped interpreter. This position would elegantly vindicate supervenience without explaining it, at the price of a kind of anti-realism about the mind. It is argued that the price is not worth paying. ;In the sixth chapter it is argued that if the phenomenal aspects of the mind supervene, they do so mysteriously. An argument is then presented for psycho-physical supervenience. It was argued earlier that if supervenience holds for intentional states, it cannot be adequately explained. Therefore physicalism is true, but the mind-body problem has no solution. (shrink)

In this book, Newell makes the case for unified theories by setting forth a candidate.

This report reviews what quantum physics and information theory have to tell us about the age-old question, How come existence? No escape is evident from four conclusions: (1) The world cannot be a giant machine, ruled by any preestablished continuum physical law. (2) There is no such thing at the microscopic level as space or time or spacetime continuum. (3) The familiar probability function or functional, and wave equation or functional wave equation, of standard quantum theory provide mere continuum idealizations (...) and by reason of this circumstance conceal the information-theoretic source from which they derive. (4) No element in the description of physics shows itself as closer to primordial than the elementary quantum phenomenon, that is, the elementary device-intermediated act of posing a yes-no physical question and eliciting an answer or, in brief, the elementary act of observer-participancy. Otherwise stated, every physical quantity, every it, derives its ultimate significance from bits, binary yes-or-no indications, a conclusion which we epitomize in the phrase, it from bit. (shrink)

The paper begins with a general introduction to the nature of human consciousness and outlines several different philosophical approaches. A critique of traditional reductionist and dualist positions is offered and it is suggested that consciousness should be viewed as an emergent property of physical systems. However, although consciousness has its origin in distributed brain processes it has macroscopic properties - most notably the `unitary sense of self', non-deterministic free will, and non-algorithmic `intuitive' processing - which can best be described by (...) quantum-mechanical principles. (shrink)

Conscious experience is one of the most difficult and thorny problems in psychological science. Its study has been neglected for many years, either because it was thought to be too difficult, or because the relevant evidence was thought to be poor. Bernard Baars suggests a way to specify empirical constraints on a theory of consciousness by contrasting well-established conscious phenomena - such as stimulus representations known to be attended, perceptual, and informative - with closely comparable unconscious ones - such as (...) stimulus representations known to be preperceptual, unattended, or habituated. Adducing data to show that consciousness is associated with a kind of global workplace in the nervous system, and that several brain structures are known to behave in accordance with his theory, Baars helps to clarify many difficult problems. (shrink)

For the uninitiated, there are two major tendencies in the modeling of human cognition. The older, tradtional school believes, in essence, that full human cognition can be modeled by dividing the world up into distinct entities -- called __symbol s__-- such as “dog”, “cat”, “run”, “bite”, “happy”, “tumbleweed”, and so on, and then manipulating this vast set of symbols by a very complex and very subtle set of rules. The opposing school claims that this system, while it might be good (...) at concluding that Paris is the capital of France or that there must be blood flowing in the left-rear leg of a cow, can never capture the full measure -- indeed, the essence -- of human cognition. For them, the essential features of cognition emerge from the combined effects of myriad, tiny actions far below the surface of consciousness. This is the camp to which Paul Churchland belongs. (shrink)

What psychological and philosophical significance should we attach to recent efforts at computer simulations of human cognitive capacities? In answering this question, I find it useful to distinguish what I will call "strong" AI from "weak" or "cautious" AI. According to weak AI, the principal value of the computer in the study of the mind is that it gives us a very powerful tool. For example, it enables us to formulate and test hypotheses in a more rigorous and precise fashion. (...) But according to strong AI, the computer is not merely a tool in the study of the mind; rather, the appropriately programmed computer really is a mind, in the sense that computers given the right programs can be literally said to. (shrink)

Presenting a look at the human mind's capacity while criticizing artificial intelligence, the author makes suggestions about classical and quantum physics and ..

Winner of the Wolf Prize for his contribution to our understanding of the universe, Penrose takes on the question of whether artificial intelligence will ever ...

Consciousness is a mongrel concept: there are a number of very different "consciousnesses." Phenomenal consciousness is experience; the phenomenally conscious aspect of a state is what it is like to be in that state. The mark of access-consciousness, by contrast, is availability for use in reasoning and rationally guiding speech and action. These concepts are often partly or totally conflated, with bad results. This target article uses as an example a form of reasoning about a function of "consciousness" based on (...) the phenomenon of blindsight. Some information about stimuli in the blind field is represented in the brains of blindsight patients, as shown by their correct "guesses," but they cannot harness this information in the service of action, and this is said to show that a function of phenomenal consciousness is somehow to enable information represented in the brain to guide action. But stimuli in the blind field are BOTH access-unconscious and phenomenally unconscious. The fallacy is: an obvious function of the machinery of access-consciousness is illicitly transferred to phenomenal consciousness. (shrink)

In this provocative book, Fred Dretske argues that to achieve an understanding of the mind it is not enough to understand the biological machinery by means of...

Little, Brown, 1992 Review by Glenn Branch on Jul 5th 1999 Volume: 3, Number: 27.

When philosophers and psychologists think about consciousness, they generally focus on one or more of three features: phenomenality , intentionality , and introspectibility . Using examples from empirical psychology and neuroscience, I argue that consciousness is not a unitary state, that, instead, these three features characterize different and dissociable states, which often happen to occur together. Understanding these three features as dissociable from each other will resolve philosophical disputes and facilitate scientific investigation.

Introduction -- A default position -- Experience -- The character of experience -- Understanding-experience -- A note about dispositional mental states -- Purely experiential content -- An account of four seconds of thought -- Questions -- The mental and the nonmental -- The mental and the publicly observable -- The mental and the behavioral -- Neobehaviorism and reductionism -- Naturalism in the philosophy of mind -- Conclusion: The three questions -- Agnostic materialism, part 1 -- Monism -- The linguistic argument (...) -- Materialism and monism -- A comment on reduction -- The impossibility of an objective phenomenology -- Asymmetry and reduction -- Equal-status monism -- Panpsychism -- The inescapability of metaphysics -- Agnostic materialism, part 2 -- Ignorance -- Sensory spaces -- Experience, explanation, and theoretical integration -- The hard part of the mind-body problem -- Neutral monism and agnostic monism -- A comment on eliminativism, instrumentalism, and so on -- Mentalism, idealism, and immaterialism -- Mentalism -- Strict or pure process idealism -- Active-principle idealism -- Stuff idealism -- Immaterialism -- The positions restated -- The dualist options -- Frege's thesis -- Objections to pure process idealism -- The problem of mental dispositions -- Mental -- Shared abilities -- The sorting ability -- The definition of mental being -- Mental phenomena -- The view that all mental phenomena are experiential phenomena -- Natural intentionality -- E/c intentionality -- The experienceless -- Intentionality and abstract and nonexistent objects -- Experience, purely experiential content, and n/c intentionality -- Concepts in nature -- Intentionality and experience -- Summary with problem -- Pain and pain -- The neo-behaviorist view -- A linguistic argument for the necessary connection between pain and behavior -- A challenge -- The Sirians -- N.N. Novel -- An objection to the Sirians -- The Betelgeuzians -- The point of the Sirians -- Functionalism, naturalism, and realism about pain -- Unpleasantness and qualitative character -- The weather watchers -- The rooting story -- What is it like to be a weather watcher? -- The aptitudes of mental states -- The argument from the conditions for possessing the concept of space -- The argument from the conditions for language ability -- The argument from the nature of desire -- Desire and affect -- The argument from the phenomenology of desire -- Behavior -- A hopeless definition -- Difficulties -- Other-observability -- Neo-behaviorism -- The concept of mind. (shrink)

The book is an extended study of the problem of consciousness. After setting up the problem, I argue that reductive explanation of consciousness is impossible , and that if one takes consciousness seriously, one has to go beyond a strict materialist framework. In the second half of the book, I move toward a positive theory of consciousness with fundamental laws linking the physical and the experiential in a systematic way. Finally, I use the ideas and arguments developed earlier to defend (...) a form of strong artificial intelligence and to analyze some problems in the foundations of quantum mechanics. (shrink)

The contributions to this book are original articles, representing a cross-section of current philosophical work on consciousness and thereby allowing students and readers from other disciplines to acquaint themselves with the very latest debate, so that they can then pursue their own research interests more effectively. The volume includes a bibliography on consciousness in philosophy, cognitive science and brain research, covering the last 25 years and consisting of over 1000 entries in 18 thematic sections, compiled by David Chalmers and Thomas (...) Metzinger. (shrink)

[opening paragraph] -- Clark: The `astonishing hypothesis' which you put forward in your book, and which you obviously feel is very controversial, is that `You, your joys and sorrows, your memories and ambitions, your sense of personal identity and free will are, in fact, no more than the behaviour of a vast assembly of nerve cells. As Lewis Carroll's Alice might have phrased it: `You're nothing but a pack of neurons'.' But it seems to me that this is not so (...) astonishing a statement for a scientist to make. Isn't this what reductionist science has always believed? (shrink)

Many philosophers doubt that one can provide any successful explanation of sensory qualities - of how things look, feel, or seem to a perceiving subject. To provide such an explanation, one would need to explain qualitative facts in non-qualitative terms. Attempts to construct such explanations have seemed, in principle, doomed. Austen Clark examines the strategy used in psychophysics, psychometrics, and sensory neurophysiology to explain qualitative facts. He argues that this strategy could succeed: its structure is sound, and it can answer (...) the various philosophical objections lodged against it. On this basis Professor Clark presents an analysis of senosry qualities that offers the possibility of explaining at least some qualia, and he sketches how this scheme might eventually reduce to neurophysiology. If he is correct, we are not doomed to an eternity of mere acquaintance with our qualia. (shrink)

[opening paragraph] -- Clark: The `astonishing hypothesis' which you put forward in your book, and which you obviously feel is very controversial, is that `You, your joys and sorrows, your memories and ambitions, your sense of personal identity and free will are, in fact, no more than the behaviour of a vast assembly of nerve cells. As Lewis Carroll's Alice might have phrased it: `You're nothing but a pack of neurons'.' But it seems to me that this is not so (...) astonishing a statement for a scientist to make. Isn't this what reductionist science has always believed? (shrink)

Having laid the groundwork in his critically acclaimed books Neural Darwinism (Basic Books, 1987) and Topobiology (Basic Books, 1988), Nobel laureate Gerald M. Edelman now proposes a comprehensive theory of consciousness in The Remembered ...

Investigations of the function of consciousness in human information processing have focused mainly on two questions: (1) where does consciousness enter into the information processing sequence and (2) how does conscious processing differ from preconscious and unconscious processing. Input analysis is thought to be initially "preconscious," "pre-attentive," fast, involuntary, and automatic. This is followed by "conscious," "focal-attentive" analysis which is relatively slow, voluntary, and flexible. It is thought that simple, familiar stimuli can be identified preconsciously, but conscious processing is needed (...) to identify complex, novel stimuli. Conscious processing has also been thought to be necessary for choice, learning and memory, and the organization of complex, novel responses, particularly those requiring planning, reflection, or creativity. (shrink)

Robert Kirk uses the notion of "raw feeling" to bridge the intelligibility gap between our knowledge of ourselves as physical organisms and our knowledge of ..