| The size and number of plaid blobs mediate the misperception of type-II plaid direction. | |
| | |
MedLine Citation:
|
PMID: 9068836 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The misperceived direction of type-II plaids has posed a problem for the intersection of constraints (IOC) model of two-dimensional motion perception. Alais et al. (1994, Vision Research, 34, 1823-1834) examined the perceived direction of type-II plaids and concluded that in addition to the direction signalled by the IOC process, a monocular mechanism signalling the motion of plaid features (blobs) is also involved in plaid perception. It was shown that the prominence of this monocular signal in plaid direction judgements depended on several variables, and the notion of blob "optimality" was introduced. This explained the more veridical direction of "optimal" blob plaids in terms of their more effectively activating the proposed feature-sensitive motion mechanism. One distinction between "optimal" and "non-optimal" blob plaids is their different component spatial frequencies, which necessarily entails a difference in the number and size of the blobs and thus raises potential confounds, since both the nature of the blobs and the components differ, which might affect the postulated blob mechanism and/or the IOC process. In the present paper, by offsetting changes in spatial frequency with changes in aperture size so that blob number is held constant, we examine whether differences in sheer blob number or size can alter perceived type-II plaid direction. The results reveal effects of both blob number and blob size, and their implications for the underlying mechanism are considered. Alternative accounts of the results in terms of the IOC model or revisions of it cannot explain the data. Comparison of monocular and binocular conditions adds further systematic evidence in support of the monocularity of the feature-sensitive motion mechanism. |
| | |
Authors:
|
D Alais; P Wenderoth; D Burke |
Related Documents
:
|
7215496 - Simultaneous determination of directional tuning of complex cells in cat striate cortex... 10859126 - A theoretical light-curve model for the 1985 outburst of rs ophiuchi. 20057746 - dirichlet's theorem 15208006 - The trial context determines adjusted localization of stimuli: reconciling the fröhlic... 22353566 - Evidence for auditory-visual processing specific to biological motion. 21086046 - 1/f neural noise reduction and spike feature extraction using a subset of informative s... |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Vision research Volume: 37 ISSN: 0042-6989 ISO Abbreviation: Vision Res. Publication Date: 1997 Jan |
Date Detail:
|
Created Date: 1997-04-09 Completed Date: 1997-04-09 Revised Date: 2006-11-15 |
Medline Journal Info:
|
Nlm Unique ID: 0417402 Medline TA: Vision Res Country: ENGLAND |
Other Details:
|
Languages: eng Pagination: 143-50 Citation Subset: IM; S |
Affiliation:
|
Department of Psychology, School of Behavioural Sciences, Macquarie University, Sydney N.S.W., Australia. alaisd@ctrvax.vanderbilt.edu |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Analysis of Variance Humans Motion Perception / physiology* Size Perception / physiology Vision, Binocular / physiology Vision, Monocular / physiology |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Perceived location of bars and edges in one-dimensional images: computational models and human visio...
Next Document: Orientation anisotropy and strabismus.