Retinotopic distribution of chromatic responses in human primary visual cortex.

Retinotopic distribution of chromatic responses in human primary visual cortex. Research Abstract Details 

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Retinotopic distribution of chromatic responses in human primary visual cortex. Abstract Text:

S Vanni,L Henriksson,M Viikari,A C James,

In non-human primates at least three anatomically and functionally distinct channels convey signals from the retina to the primary visual cortex (V1). Two of these channels, the parvocellular and the koniocellular, are sensitive to chromatic contrasts and form the basis of color vision. In humans, common phylogenetic history with other primates and psychophysical experiments suggest identical retinocortical mechanisms but separate evaluation of the distinct anatomical channels has been difficult because signals are already combined in V1. We studied the spatial distribution of activation to chromatic stimuli along the two opponent chromatic axes in human V1 with multifocal functional magnetic resonance imaging. The signal strength was quantified from three experiments with stimuli up to 20 degrees eccentricity. The hypothesis was that, although the parvo- and koniocellular signals are mixed in V1, distinct distributions of signal strength would be evident. We found that whereas different conditions activated the same areas of cortex, indicating that they have identical magnification factors, the responses to red/green stimulation were stronger close to the fovea whereas the blue/yellow responses were much less diminished with increasing eccentricity. Both chromatic axes showed saturating contrast response functions. Our measure directly from human V1 is in line with earlier psychophysical studies suggesting relatively stronger parvocellular channel representation close to the fovea, and more uniform distribution of the koniocellular and achromatic channels. In addition, our study presents a way to rapidly quantify retinotopic signal transmission in distinct retinocortical pathways of individual subjects.

Retinotopic distribution of chromatic responses in human primary visual cortex. Publishing Authors By Initials

S Vanni,L Henriksson,M Viikari,AC James,

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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Retinotopic distribution of chromatic responses in human primary visual cortex. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: The European journal of neuroscience

VOLUME: 24

Page Numbers: 1821-31

Journal Abbreviation: Eur. J. Neurosci.

ISSN: 0953-816X

DAY: 3

MONTH: Sep

YEAR: 2006

Retinotopic distribution of chromatic responses in human primary visual cortex. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 8918110

Retinotopic distribution of chromatic responses in human primary visual cortex. Keywords Mesh Terms:

KEYWORDS: Visual Pathways

MESH TERMS: physiology

Chemical & Substance for Abstract: Retinotopic distribution of chromatic responses in human primary visual cortex. Information

Substance Name: Oxygen

Registry Number: 7782-44-7

Grant and Affiliation Information for Retinotopic distribution of chromatic responses in human primary visual cortex.

AFFILIATION: Brain Research Unit, Low Temperature Laboratory, Research School of Biological Sciences, Australian National University, Canberra, Australia.

Country: France

AGENCY: United States NCRR

GRANT: RR-13622

ACRONYM: RR

MEDLINETA: Eur J Neurosci

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