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Journal of Neuroscience, Vol 10, 2791-2803, Copyright © 1990 by Society for Neuroscience
Functional organization in the ferret visual cortex: a double-label 2- deoxyglucose study
C Redies, M Diksic and H Riml
Montreal Neurological Institute, Quebec, Canada.
The functional organization of visual cortical area 17/18 of the ferret was
studied using a double-label 2-deoxyglucose (2-DG) method. Animals were
stimulated sequentially with moving gratings of 2 different orientations.
Elongated orientational patches running roughly at a right angle into the
area 17/18 border were seen. The orientation maps were similar in areas 17
and 18. When animals were stimulated with 2 orthogonally oriented gratings,
activation patterns were not fully complementary but did not overlap. A
complex pattern of partial overlap was observed, with orientations
differing by 45 degrees. More gradual and more abrupt changes alternated
frequently on a scale smaller than the average periodicity in the patterns.
A cortical patch representing a given orientation was regularly surrounded
by both neighboring and orthogonal orientations. The direction of the
orientational changes reversed frequently in the immediate vicinity of any
orientational patch. Orientation maps were compared with complete maps of
retino- cortical projections obtained by transneuronal labeling with
intravitreally injected tritiated proline. Ocular dominance in the
binocular segment of both areas 17 and 18 was found to be organized into
elongated ipsilateral islands in an almost contiguous contralateral
projection. In area 18, the patches were wider than in area 17, and the
ipsilateral islands were smaller in the regions representing the upper and
central visual field than in those representing the lower visual field.
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