Spatial Resolution and Contrast Sensitivity of Single Neurons in Area 19 of Split-chiasm Cats: A Comparison With Primary Visual Cortex

Electrophysiological recordings were carried out in the callosal recipient zone of area 19 in normal and split‐chiasm cats and, for comparison purposes, at the border of areas 17 and 18 of split‐chiasm cats. The influences of retinothalamic and callosal inputs on a single cortical neurons were there...

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Bibliographic Details
Published in:The European journal of neuroscience 1997-09, Vol.9 (9), p.1929-1939
Main Authors: Tardif, Eric, Richer, Louis, Bergeron, André, Lepore, Franco, Guillemot, Jean-Paul
Format: Article
Language:English
Subjects:
Animals
area 19
areas 17/18
Brain Mapping - methods
Cats
Contrast Sensitivity
contrast threshold
corpus callosum
Corpus Callosum - cytology
Corpus Callosum - physiology
Dominance, Cerebral - physiology
Female
Linear Models
Male
Neurons - physiology
Optic Chiasm - cytology
Optic Chiasm - physiology
spatial frequency
Thalamus - physiology
Visual Cortex - cytology
Visual Cortex - physiology
Visual Fields - physiology
Visual Pathways - physiology
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Summary:Electrophysiological recordings were carried out in the callosal recipient zone of area 19 in normal and split‐chiasm cats and, for comparison purposes, at the border of areas 17 and 18 of split‐chiasm cats. The influences of retinothalamic and callosal inputs on a single cortical neurons were thereby evaluated. Extracellular recordings of single cells were made in anaesthetized and paralysed cats in the zone representing the central visual field. Receptive field properties were assessed using sine wave gratings drifting in optimal directions. Results showed that in area 19 and areas 17/18 one‐third of the cells were binocularly driven after section of the optic chiasm. In area 19, the spatial resolution and contrast sensitivity of cells driven via the dominant eye were similar in the normal and split‐chiasm groups. In areas 17/18 and area 19 of split‐chiasm cats, binocular cells showed significant interocular matching of their receptive field properties (spatial resolution and contrast threshold), although small differences were observed. These small interocular differences were related to the cell's Ocular dominance rather than to the signal transmission route (thalamic or callosal).
ISSN:0953-816X
1460-9568
DOI:10.1111/j.1460-9568.1997.tb00760.x