Biomedical subjects

T Natsoulas

Publications and source records attributed to T Natsoulas.

14 recordsLinked to original sources

PubMed1995

A rediscovery of Sigmund Freud.

As part of his rediscovery of consciousness, Searle has recently provided an interpretation of Freud's account of consciousness, including the relation of consciousness to nonconscious mental occurrences [i.e., preconscious mental occurrences and unconscious (repressed) mental occurrences]. Regrettably, Searle's interpretation is based on a single paragraph from The Unconscious and serves to eliminate Freud's general view on these matters as being "incoherent." In the present article, I rediscover Freud's account and show that Searle has deeply misunderstood him, thus converting Freud into a "mental-eye" theorist of consciousness when Freud is actually an "intrinsic" theorist. I point out that Freud's and Searle's views on consciousness are actually similar, though Searle denies the existence of nonconscious mental occurrences. My discussion of Freud's account of consciousness addresses as well (a) Freud's understanding of emotions and feelings, including what he calls "misconstrued" emotions, and repression that works to suppress the development of affect, and (b) why Freud held that emotions and feelings never occur except consciously. I hope that my present contribution will be part of an intensive discussion that will proceed among psychologists of consciousness in a conscious and deliberate joint effort to develop the theory of consciousness.

Consciousness↗

PubMed1992

The tunnel effect, Gibson's perception theory, and reflective seeing.

Subjects can have continuous visual experience of an object's movement across a display though the movement's middle phase takes place behind an opaque screen. The present article considers explanatory issues pertaining to this so-called, tunnel effect, with special reference to Gibson's perception theory and the visual activity that I have been calling reflective seeing. Among the issues discussed are the following. (a) In the tunnel experiments, I suggest, there occur both persisting perception, as Michotte held, and persistence perception, as Gibson held. The subjects pick up stimulus information that allows visually experiencing the object's going out of sight at one edge of the screen and coming back into sight at another edge of the screen; the subjects have visual experience of the continued existence and movement of the object while it is out of sight. Moreover, persistence of perceptual experience is involved: when the object goes out of sight, the subjects' visual experience of its movement goes on. (b) I also argue that the tunnel effect is a phenomenon of both straightforward and reflective seeing. Adopting a phenomenal attitude, as one does when reporting one's perceptual experience, one still sees movement taking place on the other side of the screen, as one does in straightforward seeing. However, whereas straightforward seeing does not give inner awareness of visual experience, the subjects in the tunnel experiments report visually experiencing the object's movement while also visually experiencing the opaque screen in front of it as opaque. I argue that these reports, and those about the object's going out of and coming back into sight, must be based on the kind of visual experience that is part and product of reflective seeing.

Attention↗

PubMed1990

Perspectival appearing and Gibson's theory of visual perception.

Although Gibson (1979) did not explicitly discuss the perspectival appearing of the ecological environment, his important ecological approach to visual perception can accommodate both (a) the stream of visual-perceptual experience that flows at the heart of the visual system's total activity of ordinary visual preceiving (ordinary seeing), and (b) the dimension of the visual experiential stream that is the ecological environment's perspectival appearing to the visual perceiver. In the present article, perspectival appearing is located at the level of brain centers of the visual system, where processes are determined by the spatiotemporally structured visual stimulus flux. And the stream of visual experience is interpreted as itself possessing a kind of perspective structure (as does the visual stimulus flux), including variant and invariant features that the visual system isolates and extracts from experience, producing the perceiver's cognitive visual "awareness-of" (Gibson, 1979) the environment and self in the environment.

Attention↗

PubMed1989

From visual sensations to the seen-now and the seen-from-here.

If, as Gibson last proposed, we become aware (in the introspective attitude during visual perceiving) of the seen-now and the seen-from-here as such, there must occur not only outer awareness of these surfaces, but also a kind of inner awareness of certain of their experiential effects upon us. From Gibson's perspective, this conclusion would seem to mean that his ecological account must return, in this context, to visual sensations; or preferably it must include visual-perspectival appearances proceeding normally unnoticed in the stream of consciousness during visual perception of the environment.

Attention↗

PubMed1989

The ecological approach to perception: the place of perceptual content.

The kind of perceptual systems that human beings possess enables each of us to respond in highly adaptive deliberate ways that take into account the suitability of particular behaviors to what we are aware of ourself as experiencing perceptually here and now. In deciding what to do next under the perceived circumstances, content is the dimension of perceptual experience that we consult. For perceptual content is how whatever the perceiver is now having perceptual experience of is given in or taken by the respective perceptual experience. Perceptual content includes presentational content, which is all the ways that what you are perceptually experiencing may be appearing to you, and intentional content, which is all the ways that your stream of perceptual experience may take to be that of which you have perceptual awareness in the environment or self. Therefore, perceptual content must be distinguished from the intentional object of perceptual awareness, which is that property, event, or entity of which you have perceptual awareness. Gibson proposed that there is no perceptual content independent of the particular intentional objects that one perceptually apprehends, which are always part of the ecological environment. This externalization of perceptual content was due, no doubt, to Gibson's conception of perceptually apprehending anything at all as not mediated by awareness of anything else, such as something immanent in perceptual experience itself. However, perceptual content need not be, theoretically, a replacement for what the perceiver has perceptual awareness of. During straightforward perceiving, the perceiver does not have awareness of perceptual content but of parts of the ecological environment including the perceiver. Perceptual content is how the external intentional object perspectivally appears from moment to moment and how it is perceptually taken to be, veridically or not. Perceptual taking of an ecological property is always in one or another of the latter's instantiations, and perceptual taking of an ecological entity or event is always with properties. The perceptual intentional object's appearing in a particular manner is distinct from perceptually taking the intentional object. For example, an ecological property may be taken quite veridically yet through a flow of varying appearance. And even when the property appears in a constant way, perceptual awareness may take it differently from one moment to the next. For example, a perceiver may have visual awareness of a surface without noticing the surface's color-texture, though the color-texture may appear to the perceiver throughout looking at the surface, before and after he or she stops noticing the color-texture.(ABSTRACT TRUNCATED AT 400 WORDS)

Attention↗

PubMed1983

What are the objects of perceptual consciousness?

Four answers to the title question are critically reviewed. (a) The first answer proposes that we perceive our brain events, certain occurrences in our brain that appear to us as parts of the environment. (b) Gestalt psychology distinguishes the phenomenal from the physical and proposes that we always perceive some aspect of our own phenomenal world--which is isomorphic but not identical to certain of our brain events. (c) J. J. Gibson held that our perceptual experiences are registrations of properties of the external environment--which is, therefore, perceived directly (i.e., without experiencing anything else). (d) The fourth answer comprehends perceptual experience to be a qualitative form of noninferential awareness of the apparent properties of specific environmental things. It differs from Gibson's answer in several respects, including the claim that some aspect of the external world appears to us whenever we have perceptual experience.

Awareness↗

PubMed1974