| Functional organization for direction of motion and its relationship to orientation maps in cat area 18. | |
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MedLine Citation:
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PMID: 8824332 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The goal of this study was to explore the functional organization of direction of motion in cat area 18. Optical imaging was used to record the activity of populations of neurons. We found a patchy distribution of cortical regions exhibiting preference for one direction over the opposite direction of motion. The degree of clustering according to preference of direction was two to four times smaller than that observed for orientation. In general, direction preference changed smoothly along the cortical surface; however, discontinuities in the direction maps were observed. These discontinuities formed lines that separated pairs of patches with preference for opposite directions. The functional maps for direction and for orientation preference were closely related; typically, an iso-orientation patch was divided into regions that exhibited preference for opposite directions, orthogonal to the orientation. In addition, the lines of discontinuity within the direction map often connected points of singularity in the orientation map. Although the organization of both domains was related, the direction and the orientation selective responses were separable; whereas the selective response according to direction of motion was nearly independent of the length of bars used for visual stimulation, the selective response to orientation decreased significantly with decreasing length of the bars. Extensive single and multiunit electrical recordings, targeted to selected domains of the functional maps, confirmed the features revealed by optical imaging. We conclude that significant processing of direction of motion is performed early in the cat visual pathway. |
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Authors:
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A Shmuel; A Grinvald |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The Journal of neuroscience : the official journal of the Society for Neuroscience Volume: 16 ISSN: 0270-6474 ISO Abbreviation: J. Neurosci. Publication Date: 1996 Nov |
Date Detail:
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Created Date: 1996-11-27 Completed Date: 1996-11-27 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 8102140 Medline TA: J Neurosci Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 6945-64 Citation Subset: IM; S |
Affiliation:
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Department of Neurobiology, The Weizmann Institute of Science, Rehovot 76100, Israel. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Age Factors Animals Brain Mapping* Cats Cell Count Evoked Potentials, Visual / physiology Image Processing, Computer-Assisted Microelectrodes Motion Perception / physiology* Photic Stimulation Time Factors Visual Cortex / cytology, physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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