| Velocity invariance of preferred axis of motion for single spot stimuli in simple cells of cat striate cortex. | |
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MedLine Citation:
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PMID: 7895795 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Directional tuning for motion of a long bar and a spot was compared quantitatively over a wide range of velocities in 23 simple cells of cat striate cortex whose "on" and "off" receptive field subregions had been mapped with optimally oriented, stationary flash-presented bars. Tuning curves were derived using stimuli whose polarity of contrast was appropriate for the dominant receptive field subregion of each cell (i.e. light stimuli for on-subregions and dark stimuli for off-subregions); stimulus sweep was centred accurately on the centre of that subregion. Bar stimuli were of optimal width, and spot diameter was equal to the width of the bars. In all simple cells, preferred axis of motion for a long bar was invariant with velocity, being orthogonal to preferred orientation, as assessed with a stationary flash-presented bar. In 20 of 23 simple cells, preferred axis for spot motion was approximately orthogonal to that for bar motion (i.e., parallel to preferred orientation) at all velocities tested, including those just above threshold for spot stimuli. However, tuning for the spot became sharper as velocity was increased, due to an increase in response to the spot moving along the preferred axis and a decrease in response to spot motion along other axes, including the preferred axis for the bar. Both preferred and upper cut-off velocity were consistently higher for spot than for bar motion. The remaining 3 simple cells showed no response to spot motion at any velocity, and their preferred axis of motion for the shortest bar which evoked a consistent response was the same as the long bar.(ABSTRACT TRUNCATED AT 250 WORDS) |
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Authors:
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J M Crook; F Wörgötter; U T Eysel |
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Publication Detail:
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Type: Comparative Study; Journal Article |
Journal Detail:
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Title: Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale Volume: 102 ISSN: 0014-4819 ISO Abbreviation: Exp Brain Res Publication Date: 1994 |
Date Detail:
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Created Date: 1995-04-25 Completed Date: 1995-04-25 Revised Date: 2009-11-11 |
Medline Journal Info:
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Nlm Unique ID: 0043312 Medline TA: Exp Brain Res Country: GERMANY |
Other Details:
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Languages: eng Pagination: 175-80 Citation Subset: IM |
Affiliation:
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Department of Neurophysiology, Faculty of Medicine, Ruhr University of Bochum, Germany. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animals Cats Darkness Motion Perception Neurons / physiology* Photic Stimulation Time Factors Visual Cortex / physiology* Visual Fields |
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