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Neuron. 1999 Dec;24(4):911-7.

Color signals in area MT of the macaque monkey.

Author information

1
Howard Hughes Medical Institute, Department of Neurobiology, Stanford University, California 94305, USA.

Abstract

The relationship between the neural processing of color and motion information has been a contentious issue in visual neuroscience. We examined this relationship directly by measuring neural responses to isoluminant S cone signals in extrastriate area MT of the macaque monkey. S cone stimuli produced robust, direction-selective responses at most recording sites, indicating that color signals are present in MT. While these responses were unequivocal, S cone contrast sensitivity was, on average, 1.0-1.3 log units lower than luminance contrast sensitivity. The presence of S cone responses and the relative sensitivity of MT neurons to S cone and luminance signals agree with functional magnetic resonance imaging (fMRI) measurements in human MT+. The results are consistent with the hypothesis that color signals in MT influence behavior in speed judgment tasks.

PMID:
10624954
DOI:
10.1016/s0896-6273(00)81038-7
[Indexed for MEDLINE]
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