Responses of neurons in primary visual cortex to transient changes in local contrast and luminance.

Responses of neurons in primary visual cortex to transient changes in local contrast and luminance. Research Abstract Details 

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Responses of neurons in primary visual cortex to transient changes in local contrast and luminance. Abstract Text:

Wilson S Geisler,Duane G Albrecht,Alison M Crane,

During normal saccadic inspection of natural images, the receptive fields of cortical neurons are bombarded with frequent simultaneous changes in local mean luminance and contrast, yet there have been no systematic studies of how cortical neurons respond to such stimulation. The responses of single neurons in the primary visual cortex of the cat were measured for 200 ms presentations of sine-wave gratings confined to the conventional receptive field. Both local mean luminance and contrast were parametrically and randomly varied over the 1-1.5 log unit ranges that are typical of natural images. We find that responses are strongly modulated by both the local mean luminance and contrast, but in an approximately separable manner: the contrast response function is approximately invariant except for a scale factor that depends on the local mean luminance. The shape of the temporal response profiles were found to be approximately invariant with contrast, but were strongly affected by the local mean luminance. The results suggest that most, if not all, cortical neurons carry substantial local luminance information.

Responses of neurons in primary visual cortex to transient changes in local contrast and luminance. Publishing Authors By Initials

WS Geisler,DG Albrecht,AM Crane,

For similar nervous system: central nervous system: brain: prosencephalon: telencephalon: cerebrum: cerebral cortex: occipital lobe: visual cortex research abstracts see: nervous system: central nervous system: brain: prosencephalon: telencephalon: cerebrum: cerebral cortex: occipital lobe: visual cortex research

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Responses of neurons in primary visual cortex to transient changes in local contrast and luminance. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: The Journal of neuroscience : the official journal

VOLUME: 27

Page Numbers: 5063-7

Journal Abbreviation: J. Neurosci.

ISSN: 1529-2401

DAY: 9

MONTH: May

YEAR: 2007

Responses of neurons in primary visual cortex to transient changes in local contrast and luminance. Information

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LANGUAGE: eng

NlmUniqueID: 8102140

Responses of neurons in primary visual cortex to transient changes in local contrast and luminance. Keywords Mesh Terms:

KEYWORDS: Visual Cortex

MESH TERMS: physiology

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Grant and Affiliation Information for Responses of neurons in primary visual cortex to transient changes in local contrast and luminance.

AFFILIATION: Center for Perceptual Systems and Department of Psychology, University of Texas at Austin, Austin, Texas 78712, USA. geisler@psy.utexas.edu

Country: United States

AGENCY: United States NEI

GRANT: EY02688

ACRONYM: EY

MEDLINETA: J Neurosci

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