Many current neurophysiological, psychophysical, and psychological approaches to vision rest on the idea that when we see, the brain produces an internal representation of the world. The activation of this internal representation is assumed to give rise to the experience of seeing. The problem with this kind of approach is that it leaves unexplained how the existence of such a detailed internal representation might produce visual consciousness. An alternative proposal is made here. We propose that seeing is a way of (...) acting. It is a particular way of exploring the environment. Activity in internal representations does not generate the experience of seeing. The out- side world serves as its own, external, representation. The experience of seeing occurs when the organism masters what we call the gov- erning laws of sensorimotor contingency. The advantage of this approach is that it provides a natural and principled way of accounting for visual consciousness, and for the differences in the perceived quality of sensory experience in the different sensory modalities. Sev- eral lines of empirical evidence are brought forward in support of the theory, in particular: evidence from experiments in sensorimotor adaptation, visual “filling in,” visual stability despite eye movements, change blindness, sensory substitution, and color perception. (shrink)

David Bohm was one of the foremost scientific thinkers and philosophers of our time. Although deeply influenced by Einstein, he was also, more unusually for a scientist, inspired by mysticism. Indeed, in the 1970s and 1980s he made contact with both J. Krishnamurti and the Dalai Lama whose teachings helped shape his work. In both science and philosophy, Bohm's main concern was with understanding the nature of reality in general and of consciousness in particular. In this classic work he develops (...) a theory of quantum physics which treats the totality of existence as an unbroken whole. Writing clearly and without technical jargon, he makes complex ideas accessible to anyone interested in the nature of reality. (shrink)

Ernst Cassirer occupies a unique space in Twentieth-century philosophy. A great liberal humanist, his multi-faceted work spans the history of philosophy, the philosophy of science, intellectual history, aesthetics, epistemology, the study of language and myth, and more. The Philosophy of Symbolic Forms is Cassirer's most important work. It was first published in German in 1923, the third and final volume appearing in 1929. In it Cassirer presents a radical new philosophical worldview - at once rich, creative and controversial - of (...) human beings as fundamentally "symbolic animals," placing signs and systems of expression between themselves and the world. This major new translation, the first for over fifty years, brings Cassirer's magnum opus to a new generation of students and scholars. Volume 1: Language is a fascinating examination of arguably the most fundamental of these systems of expression: human language. Cassirer traces the problem of language and expression far back in the history of philosophy, considering the work of the early Greek rationalists. He then examines the later empiricist tradition, up to the romantic tradition in the nineteenth century tackling fundamental questions about representation, signification and expression as well as language and conceptual thought in mathematics and science. Correcting important errors in previous English editions, this translation reflects the contributions of significant advances in Cassirer scholarship over the last twenty to thirty years. Each volume includes a new introduction and translator's notes by S. G. Lofts, a foreword by Peter Gordon, a glossary of key terms, and a thorough index. (shrink)

A monumental work by an important modern philosopher, Matter and Memory (1896) represents one of the great inquiries into perception and memory, movement and time, matter and mind. Nobel Prize-winner Henri Bergson surveys these independent but related spheres, exploring the connection of mind and body to individual freedom of choice. Bergson’s efforts to reconcile the facts of biology to a theory of consciousness offered a challenge to the mechanistic view of nature, and his original and innovative views exercised a profound (...) influence on other philosophers--including James, Whitehead, and Santayana--as well as novelists such as Dos Passos and Proust. Matter and Memory is essential to an understanding of Bergson’s philosophy and its legacy. (shrink)

One of the major works of an important modem philosopher, Matter and Memory investigates the autonomous yet interconnected planes formed by matter and perception on the one hand and memory and time on the other. Henry Bergson (1859-1941) was awarded the Nobel Prize in 1927. His works include Time and Free Will, An Introduction to Metaphysics, Creative Evolution, and The Creative Mind.

Understanding Computers and Cognition presents an important and controversial new approach to understanding what computers do and how their functioning is related to human language, thought, and action. While it is a book about computers, Understanding Computers and Cognition goes beyond the specific issues of what computers can or can't do. It is a broad-ranging discussion exploring the background of understanding in which the discourse about computers and technology takes place. Understanding Computers and Cognition is written for a wide audience, (...) not just those professionals involved in computer design or artificial intelligence. It represents an important contribution to the ongoing discussion about what it means to be a machine, and what it means to be human. Book jacket. (shrink)

The target article is an attempt to make some progress on the problem of color realism. Are objects colored? And what is the nature of the color properties? We defend the view that physical objects (for instance, tomatoes, radishes, and rubies) are colored, and that colors are physical properties, specifically types of reflectance. This is probably a minority opinion, at least among color scientists. Textbooks frequently claim that physical objects are not colored, and that the colors are "subjective" or "in (...) the mind." The article has two other purposes: first, to introduce an interdisciplinary audience to some distinctively philosophical tools that are useful in tackling the problem of color realism and, second, to clarify the various positions and central arguments in the debate. (shrink)

First published in 2002. Routledge is an imprint of Taylor & Francis, an informa company.

Originally published in 1987, this title intended to historically reveal, through tracing Gibson's development, the substance of his views and how they bore upon general philosophical issues in theories of knowledge, and to investigate in detail the historical context of Gibson's theoretical position within psychology. Though the author has included a history of Gibson’s perceptual research and experimentation, the focus is to explicate the 'dynamic abstract form' of Gibson’s ecological approach. His emphasis is philosophical and theoretical, attempting to bring out (...) the direction Gibson was moving in and how such changes could restructure the theoretical fabric of psychology. He devotes considerable attention to the Greeks, Medievalists, and the founders of the Scientific Revolution. This is because Gibson’s theoretical challenge runs deep into the structure of western thought. The authors' central goal was to set Gibson’s ecological theory within the historical context of fundamental philosophical-scientific issues. (shrink)

A common approach to explaining the perception of form is through the use of static features. The weakness of this approach points naturally to dynamic definitions of form. Considering dynamical form, however, leads inevitably to the need to explain how events are perceived as time-extended—a problem with primacy over that even of qualia. Optic flow models, energy models, models reliant on a rigidity constraint are examined. The reliance of these models on the instantaneous specification of form at an instant, t, (...) or across a series of such instants forces the consideration of the primary memory supporting both the perception of time-extended events and the time-extension of consciousness. This cannot be reduced to an integration over space and time. The difficulty of defining the basis for this memory is highlighted in considerations of dynamic form in relation to scales of time. Ultimately, the possibility is raised that psychology must follow physics in a more profound approach to time and motion. (shrink)

The _Symbolic Forms_ has long been considered the greatest of Cassirer’s works. Into it he poured all the resources of his vast learning about language and myth, religion, art, and science—the various creative symbolizing activities and constructions through which man has expressed himself and given intelligible objective form to this experience. “These three volumes alone make an outstanding contribution to epistemology and to the human power of abstraction. It is rather as if ‘The Golden Bough’ had been written in philosophical (...) rather than in historical terms.”—F.I.G. Rawlins, _Nature_. (shrink)

Bergson's 1896 theory of perception/memory assumed a framework anticipating the quantum revolution in physics, the still unrealized implications of this framework contributing to the large neglect of Bergson today. The basics of his model are explored, including the physical concepts he advanced before the crisis in classical physics, his concept of perception as ‘virtual action’ with its relativistic implications, and his unique explication of the subject/object relationship. All form the basis for his solution to the ‘hard’ problem. The relation between (...) Bergson and Gibson as natural complements is also explored, with Bergson providing the framework that explicates Gibson's concept of direct perception, with Gibson's resonance model as a precursor to dynamic systems models of the brain and his reliance on invariance laws defining perceived events providing more detail for the mechanisms Bergson only envisioned from afar, and with Bergson providing the basis for an otherwise missing Gibsonian model of direct memory. (shrink)

The relation between mind and matter is considered in terms of recent ideas from both phenomenology and brain science. Phenomenology is used to give clues to help bridge the brain-mind gap by providing constraints on any underlying neural architecture suggested from brain science. A tentative reduction of mind to matter is suggested and used to explain various features of phenomenological experience and of ownership of conscious experience. The crucial mechanism is the extended duration of the corollary discharge of attention movement, (...) with its gating of activity for related content. Aspects of experience considered in terms of the model are the discontinuous nature of consciousness, immunity to error through misidentification, and the state of 'pure' consciousness as experienced through meditation. Corollary discharge of attention movement is proposed as the key idea bringing together basic features of meditation, consciousness and neuroscience, and helping to bridge the gap between mind and matter. (shrink)

Bergson, writing in 1896, anticipated “sensorimotor contingencies” under the concept that perception is “virtual action.” But to explain the external image, he embedded this concept in a holographic framework where time-motion is an indivisible and the relation of subject/object is in terms of time. The target article's account of qualitative visual experience falls short for lack of this larger framework. [Objects] send back, then, to my body, as would a mirror, their eventual influence; they take rank in an order corresponding (...) to the growing or decreasing powers of my body. The objects which surround my body reflect its possible action upon them. – Henri Bergson (1896/1912, pp. 6–7). (shrink)

This paper focuses on perception and surveys the scientific evidence that the theory of direct realism adopted by most contemporary philosophers is incorrect. This evidence is provided by experiments on the spatial and temporal "filling-in" of percepts. It also examines the myth of the projection of sensations. The conclusion is that we do not perceive the world as it actually is, but as the brain computes it most probably to be.

The computational hypothesis, with its inherent representationalism, and the dynamical hypothesis, with its apparent absence of representations and its commitment to continuous time, stand at an impasse. It is unclear how the dynamical stance can handle representational thought, or how computationalism can deal effectively with a tightly coupled, reciprocally causative agent-environment system in continuous transformation. Underlying this dilemma is the complex relation of mind to time, a relation encoded in the word experience. We must ask if any hypothesis describes a (...) "device" capable of experience? Yet what is an intelligence and its thought without experience? Is a computational device, whether supporting a symbolic processor or connectionist net, intrinsically condemned to a zero degree of experience? What is required of a dynamical device? It is argued here that “semantic” intelligence and thought rests upon experience, fundamentally upon the invariance laws defined over time within conscious perception. The structure of experience is intrinsically unavailable to the computational device, limiting it to a “syntactic” intelligence. An alternative conception of a device is offered, based on Bergson conjoined with Gibson, which supports the qualitative and structural aspects of experience and the semantic. It frames a dynamical model of perception and memory in which invariance laws are intrinsic, creates a deeper notion of situatedness, and supports a concept of semantically based, representative thought founded upon perception. (shrink)

Is experience stored in the brain? The universal assumption is that it is, yet the answer to this question is critical to the theory of consciousness. If “yes,” it must be understood that this answer absolutely constrains all theories of the origin and nature of consciousness. Memory images, dreams, even perceptual images and perceptual experience must somehow be generated from stored elements within the neural substrate. If the answer is “no,” Searle’s principle of “neurobiological sufficiency,” as one example, carries no (...) force, while on the other hand, a theory of direct perception can be construed to actually require this “no” answer, but then also requires a theory of memory to support this. Yet a model of memory which does not require storage of our experience within the brain has not been attempted. An initial review is undertaken of Gibson’s (1969, 1979) ecological perception, his notion of the “direct specification” of the external perceptual image, and subsequent findings of the ecological research paradigm. Central to this model is the notion of invariance laws defining external events, for example, the mathematical laws defining texture gradients, velocity flow fields, tau ratios on these fields, inertia tensors, etc. This invariance law information drives the brain’s “specification” of the environmental image/event. Yet, problematically, the specification is necessarily always to the past, i.e., to a past form of the transformation of the environmental field. Gibson’s model has a high affinity with a model developed by Henri Bergson (1896). The model presciently assumed holographic properties in the matter-field and broke from the classical model of space and time, arguing that time-evolution or motion of the field must be treated as indivisible or, as physics is now arguing, as non-differentiable. In this framework, the brain can be viewed as supporting a modulated reconstructive wave passing through a holographic matter-field and specifying an image of the past motion of the field. In such a model, experience cannot be stored within the brain for it is not occurring solely within the brain. Yet the model contains a basic mechanism for redintegration or retrieval of experienced events. The research results in cued recall are reviewed in several areas, to include verbal learning experiments, the effect of imagery in paired-associate tasks, priming phenomena, and the very ecologically oriented subject performed tasks (SPTs). The mathematical description of events via invariance allows a precise definition of the similarity of the cue-event and allows for parametric variation of the power of the cue, thus biasing recall or recognition performance. The model is predictive, and at the minimum, holds its own with current memory models. A short survey of current models reveals that most are very vague as to what events are stored, and what “elements” of these events are stored, and even vaguer on how an experience is reconstructed. Since these models ignore the actual structure of events via invariance laws, no current models actually explain the retrieval of events per se. The proposed model, however, does not require the storage of experience within the brain, in fact holding that time-extended events, for example, velocity flow fields, cannot be so stored. Some larger implications are explored: the in principle possibility of retrieval of all experience, the operation of free recall, the nature of cognition in the model, and potential distinguishing experiments relative to current models. (shrink)