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  The Spatial Pattern of Response Magnitude and Selectivity for Orientation and Direction in Cat Visual Cortex

Swindale, N., Grinvald, A., & Shmuel, A. (2003). The Spatial Pattern of Response Magnitude and Selectivity for Orientation and Direction in Cat Visual Cortex. Cerebral Cortex, 13(3), 225-238. doi:10.1093/cercor/13.3.225.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-DCDE-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-6AD3-6
Genre: Journal Article

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Swindale, NV, Author
Grinvald, A, Author
Shmuel, A1, Author              
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1External Organizations, ou_persistent22              

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 Abstract: Optical imaging studies of orientation and direction preference in visual cortex have typically used vector averaging to obtain angle and magnitude maps. This method has shown half-rotation orientation singularities (pinwheels) located within regions of low orientation vector magnitude. Direction preference is generally orthogonal to orientation preference, but often deviates from this, particularly in regions of low direction vector magnitude. Linear regions of rapid change in direction preference terminate in or near orientation singularities. The vector-averaging method is problematic however because it does not clearly disambiguate spatial variation in orientation tuning width from variation in height. It may also wrongly estimate preferred direction in regions where preference is weak. In this paper we analyze optical maps of cat visual cortex by fitting model tuning functions to the responses. This new method reveals features not previously evident. Orientation tuning height and width vary independently across the map: tuning height is always low near singularities, however regions of broad and narrow orientation tuning width can be found in regions of low tuning height, often alternating in a spoke-like fashion around singularities. Orientation and direction preference angles are always closely orthogonal. Reversals in direction preference form lines that originate precisely in orientation singularities.

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 Dates: 2003-03
 Publication Status: Published in print
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 Identifiers: DOI: 10.1093/cercor/13.3.225
BibTex Citekey: 2398
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Title: Cerebral Cortex
Source Genre: Journal
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Publ. Info: New York, NY : Oxford University Press
Pages: - Volume / Issue: 13 (3) Sequence Number: - Start / End Page: 225 - 238 Identifier: ISSN: 1047-3211
CoNE: https://pure.mpg.de/cone/journals/resource/954925592440