Spatial frequency-specific contrast adaptation originates in the primary visual cortex.

Spatial frequency-specific contrast adaptation originates in the primary visual cortex. Research Abstract Details 

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Spatial frequency-specific contrast adaptation originates in the primary visual cortex. Abstract Text:

Thang Duong,Ralph D Freeman,

Adaptation to a high-contrast grating stimulus causes reduced sensitivity to subsequent presentation of a visual stimulus with similar spatial characteristics. This behavioral finding has been attributed by neurophysiological studies to processes within the visual cortex. However, some evidence indicates that contrast adaptation phenomena are also found in early visual pathways. Adaptation effects have been reported in retina and lateral geniculation nucleus (LGN). It is possible that these early pathways could be the physiological origin of the cortical adaptation effect. To study this, we recorded from single neurons in the cat's LGN. We find that contrast adaptation in the LGN, unlike that in the visual cortex, is not spatial frequency specific, i.e., adaptation effects apply to a broad range of spatial frequencies. In addition, aside from the amplitude attenuation, the shape of spatial frequency tuning curves of LGN cells is not affected by contrast adaptation. Again, these findings are unlike those found for cells in the visual cortex. Together, these results demonstrate that pattern specific contrast adaptation is a cortical process.

Spatial frequency-specific contrast adaptation originates in the primary visual cortex. Publishing Authors By Initials

T Duong,RD Freeman,

For similar nervous system: neural pathways: afferent pathways: visual pathways research abstracts see: nervous system: neural pathways: afferent pathways: visual pathways research

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Spatial frequency-specific contrast adaptation originates in the primary visual cortex. Journal Published:

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

Journal: Journal of neurophysiology

VOLUME: 98

Page Numbers: 187-95

Journal Abbreviation: J. Neurophysiol.

ISSN: 0022-3077

DAY: 11

MONTH: 04

YEAR: 2007

Spatial frequency-specific contrast adaptation originates in the primary visual cortex. Information

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LANGUAGE: eng

NlmUniqueID: 375404

Spatial frequency-specific contrast adaptation originates in the primary visual cortex. Keywords Mesh Terms:

KEYWORDS: Visual Pathways

MESH TERMS: physiology

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Grant and Affiliation Information for Spatial frequency-specific contrast adaptation originates in the primary visual cortex.

AFFILIATION: School of Optometry, Univ of California, Berkeley, CA 94720-2020, USA.

Country: United States

AGENCY: United States NEI

GRANT: EY03176

ACRONYM: EY

MEDLINETA: J Neurophysiol

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