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Journal of Neuroscience, Vol 8, 1531-1568, Copyright © 1988 by Society for Neuroscience
Functional anatomy of macaque striate cortex. II. Retinotopic organization
RB Tootell, E Switkes, MS Silverman and SL Hamilton
Department of Psychology, University of California, Berkeley 94720.
Macaque monkeys were shown retinotopically-specific visual stimuli during
14C-2-deoxy-d-glucose (DG) infusion in a study of the retinotopic
organization of primary visual cortex (V1). In the central half of V1, the
cortical magnification was found to be greater along the vertical than
along the horizontal meridian, and overall magnification factors appeared
to be scaled proportionate to brain size across different species. The
cortical magnification factor (CMF) was found to reach a maximum of about
15 mm/deg at the representation of the fovea, at a point of acute curvature
in the V1-V2 border. We find neither a duplication nor an
overrepresentation of the vertical meridian. The magnification factor did
not appear to be doubled in a direction perpendicular to the ocular
dominance strips; it may not be increased at all. The DG borders in
parvorecipient layer 4Cb were found to be as sharp as 140 micron
(half-amplitude, half width), corresponding to a visual angle of less than
2' of arc at the eccentricity measured. In other layers (including
magnorecipient layer 4Ca), the retinotopic borders are broader. The
retinotopic spread of activity is greater when produced by a
low-spatial-frequency grating than when produced by a
high-spatial-frequency grating. Orientation- specific stimuli produced a
pattern of activation that spread further than 1 mm across cortex in some
layers. Some DG evidence suggests that the spread of functional activity is
greater near the foveal representation than near 5 degrees eccentricity.
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