Residual processing of chromatic signals in the absence of a geniculostriate projection

J L Barbur; A Sahraie; Andrew Simmons; L Weiskrantz; Steven Williams

Residual processing of chromatic signals in the absence of a geniculostriate projection

J L Barbur, A Sahraie, Andrew Simmons, L Weiskrantz, Steven Williams

Neuroimaging

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

We have investigated the residual processing of chromatic signals in a subject with unilateral damage to the primary visual cortex using psychophysical, pupillometric and functional magnetic resonance imaging (fMRI) methods. Of particular interest was to establish the correlation between the subject's ability to make use of chromatic signals in the blind hemifield to discriminate between different coloured targets, the corresponding residual pupil colour responses and the level and location of cortical activation generated by the same stimuli as revealed by fMRI. The results obtained using the three different experimental approaches are consistent and suggest that retrograde degeneration of thalamic and retinal chromatic processing mechanisms caused by damage to the primary visual cortex in man does not abolish completely the ability to process chromatic signals particularly when large, long-wavelength stimuli are employed.

Original language	English
Pages (from-to)	3347-53
Journal	Vision Research
Volume	35
Issue number	21
Publication status	Published - Nov 1998

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title = "Residual processing of chromatic signals in the absence of a geniculostriate projection",

abstract = "We have investigated the residual processing of chromatic signals in a subject with unilateral damage to the primary visual cortex using psychophysical, pupillometric and functional magnetic resonance imaging (fMRI) methods. Of particular interest was to establish the correlation between the subject's ability to make use of chromatic signals in the blind hemifield to discriminate between different coloured targets, the corresponding residual pupil colour responses and the level and location of cortical activation generated by the same stimuli as revealed by fMRI. The results obtained using the three different experimental approaches are consistent and suggest that retrograde degeneration of thalamic and retinal chromatic processing mechanisms caused by damage to the primary visual cortex in man does not abolish completely the ability to process chromatic signals particularly when large, long-wavelength stimuli are employed.",

author = "Barbur, {J L} and A Sahraie and Andrew Simmons and L Weiskrantz and Steven Williams",

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T1 - Residual processing of chromatic signals in the absence of a geniculostriate projection

AU - Barbur, J L

AU - Sahraie, A

AU - Simmons, Andrew

AU - Weiskrantz, L

AU - Williams, Steven

PY - 1998/11

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N2 - We have investigated the residual processing of chromatic signals in a subject with unilateral damage to the primary visual cortex using psychophysical, pupillometric and functional magnetic resonance imaging (fMRI) methods. Of particular interest was to establish the correlation between the subject's ability to make use of chromatic signals in the blind hemifield to discriminate between different coloured targets, the corresponding residual pupil colour responses and the level and location of cortical activation generated by the same stimuli as revealed by fMRI. The results obtained using the three different experimental approaches are consistent and suggest that retrograde degeneration of thalamic and retinal chromatic processing mechanisms caused by damage to the primary visual cortex in man does not abolish completely the ability to process chromatic signals particularly when large, long-wavelength stimuli are employed.

AB - We have investigated the residual processing of chromatic signals in a subject with unilateral damage to the primary visual cortex using psychophysical, pupillometric and functional magnetic resonance imaging (fMRI) methods. Of particular interest was to establish the correlation between the subject's ability to make use of chromatic signals in the blind hemifield to discriminate between different coloured targets, the corresponding residual pupil colour responses and the level and location of cortical activation generated by the same stimuli as revealed by fMRI. The results obtained using the three different experimental approaches are consistent and suggest that retrograde degeneration of thalamic and retinal chromatic processing mechanisms caused by damage to the primary visual cortex in man does not abolish completely the ability to process chromatic signals particularly when large, long-wavelength stimuli are employed.

M3 - Article

SN - 0042-6989

VL - 35

SP - 3347

EP - 3353

JO - Vision Research

JF - Vision Research

IS - 21

ER -

Residual processing of chromatic signals in the absence of a geniculostriate projection

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