| Two-dimensional receptive-field organization in striate cortical neurons of the cat. | |
| | |
MedLine Citation:
|
PMID: 7918221 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The two-dimensional organization of receptive fields (RFs) of 44 cells in the cat visual cortex and four cells from the cat LGN was measured by stimulation with either dots or bars of light. The light bars were presented in different positions and orientations centered on the RFs. The RFs found were arbitrarily divided into four general types: Punctate, resembling DOG filters (11%); those resembling Gabor filters (9%); elongate (36%); and multipeaked-type (44%). Elongate RFs, usually found in simple cells, could show more than one excitatory band or bifurcation of excitatory regions. Although regions inhibitory to a given stimulus transition (e.g. ON) often coincided with regions excitatory to the opposite transition (e.g. OFF), this was by no means the rule. Measurements were highly repeatable and stable over periods of at least 1 h. A comparison between measurements made with dots and with bars showed reasonable matches in about 40% of the cases. In general, bar-based measurements revealed larger RFs with more structure, especially with respect to inhibitory regions. Inactivation of lower cortical layers (V-VI) by local GABA injection was found to reduce sharpness of detail and to increase both receptive-field size and noise in upper layer cells, suggesting vertically organized RF mechanisms. Across the population, some cells bore close resemblance to theoretically proposed filters, while others had a complexity that was clearly not generalizable, to the extent that they seemed more suited to detection of specific structures. We would speculate that the broadly varying forms of cat cortical receptive fields result from developmental processes akin to those that form ocular-dominance columns, but on a smaller scale. |
| | |
Authors:
|
M Sun; A B Bonds |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S. |
Journal Detail:
|
Title: Visual neuroscience Volume: 11 ISSN: 0952-5238 ISO Abbreviation: Vis. Neurosci. Publication Date: 1994 Jul-Aug |
Date Detail:
|
Created Date: 1994-10-27 Completed Date: 1994-10-27 Revised Date: 2007-11-14 |
Medline Journal Info:
|
Nlm Unique ID: 8809466 Medline TA: Vis Neurosci Country: ENGLAND |
Other Details:
|
Languages: eng Pagination: 703-20 Citation Subset: IM |
Affiliation:
|
Department of Biomedical Engineering, Vanderbilt University, Nashville. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Algorithms Animals Cats Geniculate Bodies / physiology Image Processing, Computer-Assisted Light Neurons / physiology* Visual Cortex / physiology* Visual Fields / physiology* Visual Perception |
| Grant Support | |
ID/Acronym/Agency:
|
EY03778/EY/NEI NIH HHS; EY08126/EY/NEI NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Depletion of retinal dopamine does not affect the ERG b-wave increment threshold function in goldfis...
Next Document: Differential expression of glycine receptor subunits in the retina of the rat: a study using immunoh...