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Functional anatomy of macaque striate cortex. II. Retinotopic organization

RB Tootell, E Switkes, MS Silverman and SL Hamilton
Journal of Neuroscience 1 May 1988, 8 (5) 1531-1568; https://doi.org/10.1523/JNEUROSCI.08-05-01531.1988
RB Tootell
Department of Psychology, University of California, Berkeley 94720.
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E Switkes
Department of Psychology, University of California, Berkeley 94720.
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MS Silverman
Department of Psychology, University of California, Berkeley 94720.
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SL Hamilton
Department of Psychology, University of California, Berkeley 94720.
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Abstract

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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The Journal of Neuroscience: 8 (5)
Journal of Neuroscience
Vol. 8, Issue 5
1 May 1988
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Functional anatomy of macaque striate cortex. II. Retinotopic organization
RB Tootell, E Switkes, MS Silverman, SL Hamilton
Journal of Neuroscience 1 May 1988, 8 (5) 1531-1568; DOI: 10.1523/JNEUROSCI.08-05-01531.1988

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Functional anatomy of macaque striate cortex. II. Retinotopic organization
RB Tootell, E Switkes, MS Silverman, SL Hamilton
Journal of Neuroscience 1 May 1988, 8 (5) 1531-1568; DOI: 10.1523/JNEUROSCI.08-05-01531.1988
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