| Two-dimensional map of direction selectivity in cortical visual area MT of Cebus monkey. | |
| | |
MedLine Citation:
|
PMID: 12378314 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
We studied the spatial organization of direction of motion in visual area MT of the Cebus apella monkey. We used arrays of 6 (700 micro m apart) parallel electrodes in penetrations tangential to the cortical layers to record multi-unit responses to moving bars, at 200 micro m steps. We determined the direction selectivity at each recording site. The data from single penetrations showed cyclic and gradual changes in the direction selectivity of clusters of cells, intermixed with abrupt 180 degrees discontinuities along the electrode track. In order to obtain maps of direction of motion selectivity, we examined the spatial distribution of direction of motion in MT and we applied a method to determine the location of the centers of radial arrangements of direction selectivity. This tangential organization is characterized by slow continuous changes in direction of motion, interrupted by discontinuities. The changes in direction selectivity are organized radially in a pinwheel fashion and in slabs of linear variation. The pinwheel arrangements have 800-1400 micro m in diameter. The size of the radial arrangement is comparable to the point image size in area MT at each eccentricity. |
| | |
Authors:
|
Antonia Cinira Diogo; Juliana G M Soares; Thomas D Albright; Ricardo Gattass |
Related Documents
:
|
22502564 - Performance of laser fluorescence devices and visual examination for the detection of o... 95974 - Representation of moving stimuli by somatosensory neurons. 22561254 - Light-curing efficiency of dental adhesives by gallium nitride violet-laser diode deter... 487064 - Seaward orientation of hatchling turtles: turning systems in the optic tectum. 2326144 - Discriminating rigid from nonrigid motion: minimum points and views. 18445224 - Disentangling neural structures for processing of high- and low-speed visual motion. |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Anais da Academia Brasileira de Ciências Volume: 74 ISSN: 0001-3765 ISO Abbreviation: An. Acad. Bras. Cienc. Publication Date: 2002 Sep |
Date Detail:
|
Created Date: 2002-10-14 Completed Date: 2002-12-31 Revised Date: 2006-11-15 |
Medline Journal Info:
|
Nlm Unique ID: 7503280 Medline TA: An Acad Bras Cienc Country: Brazil |
Other Details:
|
Languages: eng Pagination: 463-76 Citation Subset: IM |
Affiliation:
|
Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Brazil. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Brain Mapping / methods* Cebus Electrodes Motion Perception / physiology* Photic Stimulation Visual Cortex / physiology* |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Neurotransmitter regulation of neural development: acetylcholine and nicotinic receptors.
Next Document: Early gastric carcinoma: spread and multicentricity.