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Visually guided reaching with the forelimb contralateral to a "blind" hemisphere: a metabolic mapping study in monkeys

HE Savaki, C Kennedy, L Sokoloff and M Mishkin
Journal of Neuroscience 1 July 1993, 13 (7) 2772-2789; DOI: https://doi.org/10.1523/JNEUROSCI.13-07-02772.1993
HE Savaki
Department of Basic Sciences, School of Health Sciences, University of Crete, Iraklion, Greece.
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C Kennedy
Department of Basic Sciences, School of Health Sciences, University of Crete, Iraklion, Greece.
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L Sokoloff
Department of Basic Sciences, School of Health Sciences, University of Crete, Iraklion, Greece.
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M Mishkin
Department of Basic Sciences, School of Health Sciences, University of Crete, Iraklion, Greece.
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Abstract

The 2–14C-deoxyglucose method was used to map local cerebral metabolic activity in monkeys performing a unimanual task requiring visually guided arm reaching and key pressing. The study was carried out with monkeys that either had intact brains or had one hemisphere deprived of visual input by unilateral optic tract section combined in some cases with forebrain commissurotomy. The metabolic mapping revealed activation of sensorimotor cortex only in the hemisphere contralateral to the moving forelimb, irrespective of whether this hemisphere was intact or visually deafferented. These results suggest that visually guided reaching with the forelimb contralateral to the “blind” hemisphere is subserved by that hemisphere's sensorimotor cortex and not by the cortex of the ipsilateral, “seeing” hemisphere. Other areas that were more active metabolically in the “blind” than in the “seeing” hemisphere included the supplementary motor, the secondary somatosensory, and certain posterior parietal cortical areas, intraparietal lateral 5 (lateral 5-ip), 7a, and intraparietal 7 (7-ip). It is suggested that the “blind” hemisphere utilizes at least two distinct pieces of information to guide forelimb movements to visual targets: (1) information about the location of the visual target derived from head and eye movements made to this target and mediated via the inferior parietal cortical areas 7a and 7-ip, and (2) information about the instantaneous upper extremity position derived from forelimb proprioceptive mechanisms and mediated via the somatosensory cortex and thereafter via the superior parietal cortical area, lateral 5-ip.

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The Journal of Neuroscience: 13 (7)
Journal of Neuroscience
Vol. 13, Issue 7
1 Jul 1993
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Visually guided reaching with the forelimb contralateral to a "blind" hemisphere: a metabolic mapping study in monkeys
HE Savaki, C Kennedy, L Sokoloff, M Mishkin
Journal of Neuroscience 1 July 1993, 13 (7) 2772-2789; DOI: 10.1523/JNEUROSCI.13-07-02772.1993

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Visually guided reaching with the forelimb contralateral to a "blind" hemisphere: a metabolic mapping study in monkeys
HE Savaki, C Kennedy, L Sokoloff, M Mishkin
Journal of Neuroscience 1 July 1993, 13 (7) 2772-2789; DOI: 10.1523/JNEUROSCI.13-07-02772.1993
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