| Direction repulsion goes global. | |
| | |
MedLine Citation:
|
PMID: 12725736 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
When viewing two superimposed, translating sets of dots moving in different directions, one overestimates direction difference. This phenomenon of direction repulsion is thought to be driven by inhibitory interactions between directionally tuned motion detectors. However, there is disagreement on where this occurs-at early stages of motion processing, when local motions are extracted; or at the later, global motion-processing stage following "pooling" of these local measures. These two stages of motion processing have been identified as occurring in area V1 and the human homolog of macaque MT/V5, respectively. We designed experiments in which local and global predictions of repulsion are pitted against one another. Our stimuli contained a target set of dots, moving at a uniform speed, superimposed on a "mixed-speed" distractor set. Because the perceived speed of a mixed-speed stimulus is equal to the dots' average speed, a global-processing account of direction repulsion predicts that repulsion magnitude induced by a mixed-speed distractor will be indistinguishable from that induced by a single-speed distractor moving at the same mean speed. This is exactly what we found. These results provide compelling evidence that global-motion interactions play a major role in driving direction repulsion. |
| | |
Authors:
|
Christopher P Benton; William Curran |
Related Documents
:
|
20057746 - dirichlet's theorem 10859126 - A theoretical light-curve model for the 1985 outburst of rs ophiuchi. 1221086 - Direction selectivity of simple striate cells: properties and mechanism. 7370766 - The organization of the visual hyperstriatum in the domestic chick. ii. receptive field... 3576986 - Simple reaction time to sinusoidal grating and perceptual integration time: contributio... 17920886 - Kinetic mechanisms to alter walking speed. |
Publication Detail:
|
Type: Comparative Study; Journal Article |
Journal Detail:
|
Title: Current biology : CB Volume: 13 ISSN: 0960-9822 ISO Abbreviation: Curr. Biol. Publication Date: 2003 Apr |
Date Detail:
|
Created Date: 2003-05-02 Completed Date: 2004-03-05 Revised Date: 2006-11-15 |
Medline Journal Info:
|
Nlm Unique ID: 9107782 Medline TA: Curr Biol Country: England |
Other Details:
|
Languages: eng Pagination: 767-71 Citation Subset: IM |
Affiliation:
|
Department of Experimental Psychology, University of Bristol, 8 Woodland Road, Bristol, BS8 1TN, United Kingdom. chris.benton@bristol.ac.uk |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Humans Models, Neurological Models, Psychological Motion Perception / physiology* Pattern Recognition, Visual / physiology* Photic Stimulation Reaction Time |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: A simple reason for a big difference: wolves do not look back at humans, but dogs do.
Next Document: Assembly of a mediator/TFIID/TFIIA complex bypasses the need for an activator.