scholarly journals A computational explanation of the stereokinetic effect

2011 ◽  
Vol 11 (11) ◽  
pp. 64-64
Author(s):  
X. Yang ◽  
Z. Liu
Keyword(s):  
Computational Explanation ◽  
Stereokinetic Effect

Wobble Cones and Wobble Holes: The Stereokinetic Effect Revisited

Perception ◽  
1983 ◽  
Vol 12 (2) ◽  
pp. 187-193 ◽  
Author(s):  
John A Wilson ◽  
James O Robinson ◽  
David J Piggins
Keyword(s):  
Motion Parallax ◽  
Three Dimensional ◽  
Computer Programs ◽  
Three Dimensional Objects ◽  
Perceptual Invariance ◽  
Stereokinetic Effect

It is well-known that patterns of eccentric circles when slowly rotated give rise to compelling three-dimensional impressions of cones or conical holes which can ‘wobble’ as the pattern rotates. The wobble can be considered as part of the overall phenomenon of depth elicited from a rotating display, the ‘stereokinetic’ effect (SKE). This paper considers the three-dimensional appearance as being the result of the sliding of contours and thus it imitates the motion parallax found in real three-dimensional objects in motion. New variants of SK figures are used to examine these points. An analogy with computer programs is proposed which questions earlier views on the location of perceptual invariance.

Ecological content

1997 ◽  
Vol 5 (2) ◽  
pp. 253-281 ◽  
Author(s):  
Josefa Toribio
Keyword(s):  
Empirical Research ◽  
Developmental Psychology ◽  
Psychological Explanation ◽  
Cognitive Significance ◽  
Variable Environment ◽  
Negative Side ◽  
Embedded Cognition ◽  
Positive Side ◽  
Computational Explanation ◽  
Cognitive Activities

The paper has a negative and a positive side. The negative side argues that the classical notions of narrow and wide content are not suitable for the purposes of psychological explanation. The positive side shows how to characterize an alternative notion of content (ecological content) that is suitable for those purposes. This account is supported by (a) a way of conceptualizing computation that is constitutively dependent upon properties external to the system and (b) empirical research in developmental psychology. My main contention is that an adequate computational explanation of the behavior involved in cognitive activities should invoke a concept of content that can capture the intimate dynamical relationship between the inner and the outer. The notion of content thus reaches out to include the set of skills, abilities and know-hows that an agent deploys in a constantly variable environment. The assumption underlying my attempt to characterize this ecological notion of content is that cognition is better understood when treated as embedded cognition and that the idea of cognitive significance ought to be cashed out in non-individualistic and pragmatic terms.

scholarly journals When Mechanical Computations Explain Better

2021 ◽  
pp. 463-477
Author(s):  
Silvano Zipoli Caiani
Keyword(s):  
Dynamical System ◽  
System Theory ◽  
Environmental Variables ◽  
Epistemic Value ◽  
Dynamical System Theory ◽  
Visually Guided ◽  
Optic Ataxia ◽  
Internal Representations ◽  
Visually Guided Reaching ◽  
Computational Explanation

AbstractIn this paper I defend the epistemic value of the representational-computational view of cognition by arguing that it has explanatory merits that cannot be ignored. To this end, I focus on the virtue of a computational explanation of optic ataxia, a disorder characterized by difficulties in executing visually-guided reaching tasks, although ataxic patients do not exhibit any specific disease of the muscular apparatus. I argue that addressing cases of patients who are suffering from optic ataxia by invoking a causal role for internal representations is more effective than merely relying on correlations between bodily and environmental variables. This argument has consequences for the epistemic assessment of radical enactivism, whichRE invokes the Dynamical System Theory as the best tool for explaining cognitive phenomena.

Learning to See Stereokinetic Effects

Perception ◽  
1987 ◽  
Vol 16 (2) ◽  
pp. 187-192 ◽  
Author(s):  
Paola Bressan ◽  
Giorgio Vallortigara
Keyword(s):  
Rigid Body ◽  
Structure From Motion ◽  
Incubation Time ◽  
Stimulus Pattern ◽  
Circular Ring ◽  
Frontoparallel Plane ◽  
Stereokinetic Effect ◽  
Flat Pattern

The Saturn illusion is a stereokinetic effect that occurs when a flat pattern composed of a full ellipse with two symmetrical semirings is rotated slowly in the frontoparallel plane. Subjects report seeing an egg-shaped object inserted into a circular ring, and the two objects move solidly into 3-D space as a single rigid body. Inexperienced observers show a conspicuous delay before reaching this percept. Two experiments are reported in which it is shown that this incubation time progressively decreases with repeated exposures to the stimulus pattern. A certain amount of time (14 s on average) is, however, required to obtain the effect, even after six successive exposures. It is argued that this time, which is independent of the speed of rotation and is not further reducible, is a fixed entity and is needed to compute the most rigid 3-D solution from deformations in the 2-D image. The results are discussed in relation to current theories of perception of structure from motion.

Un debate sobre la explicación computacional de la memoria A debate about the computational explanation of memory

1998 ◽  
Vol 10 (1) ◽  
pp. 151-156
Author(s):  
María Del Carmen Puerta-Melguizo ◽  
María Teresa Bajo
Keyword(s):  
Computational Explanation
Sign in / Sign up

Export Citation Format

Share Document