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Effects of wavelength on the timing and laminar distribution of illuminance-evoked activity in macaque V1

Published online by Cambridge University Press:  02 June 2009

S.J. Givre
Affiliation:
Departments of Neuroscience and Neurology, Rose F. Kennedy Center, Albert Einstein College of Medicine, Bronx, NY
J.C. Arezzo
Affiliation:
Departments of Neuroscience and Neurology, Rose F. Kennedy Center, Albert Einstein College of Medicine, Bronx, NY
C.E. Schroeder
Affiliation:
Departments of Neuroscience and Neurology, Rose F. Kennedy Center, Albert Einstein College of Medicine, Bronx, NY

Abstract

Responses to full-field colored flashes (red, blue, and green) were compared with those to illuminancematched white flashes in area V1, optic radiations, and the lateral geniculate nucleus of two alert macaques. Laminar profiles of visual evoked potentials (VEPs), current source density, and multiunit activity were obtained using multicontact electrodes capable of sampling from all layers of cortex or lateral geniculate nucleus, simultaneously. In striate cortex, stimulation with colored flash enhanced transmembrane current flow dramatically in both layer 4c and the supragranular laminae. Stimulation with red evoked the largest enhancement in every electrode penetration. The mean peak amplitudes of current sinks evoked by red were 203% and 537% of those evoked by white light in layer 4c and the supragranular laminae, respectively. Color effects in VI were preceded by an initial epoch of wavelength-insensitive activity. In layer 4c, the red effect reached significance, on average, at 47 ms, or ≈24 ms after the onset of transmembrane current flow. In the supragranular layers, the red effect reached significance, on average, at 55 ms, or ≈14 ms after the onset of current flow. Recordings from optic radiations in the white matter below V1 and from lateral geniculate nucleus showed no significant difference in the responses to color and illuminance-matched white light. Enhancement of supragranular current flow with color stimulation increased the contribution of these laminae to the generation of the surface VHP. Comparison of the surface VHP wave forms evoked by white and color stimuli may, therefore, help to differentiate the responses of the granular and supragranular laminae.

Type
Research Articles
Copyright
Copyright © Cambridge University Press 1995

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