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Dutta, Arkadeb and Kambi, Niranjan and Raghunathan, Partha and Khushu, Subash and Jain, Neeraj (2014) Large-scale reorganization of the somatosensory cortex of adult macaque monkeys revealed by fMRI. Brain Struct Funct, 219 (4). pp. 1305-1320.

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Somatosensory cortex of adult primates undergoes topographic reorganization following spinal cord or peripheral nerve injuries. Electrophysiological studies in monkeys show that after chronic lesions of dorsal columns of the spinal cord at cervical levels, there is an expansion of face representation into the deafferented hand region of area 3b of cortex. However, these techniques can sample only a limited portion of the brain. In order to help understand mechanisms of brain reorganization use of noninvasive tools in non-human primate experimental model is important. Use of blood oxygen level dependent-functional magnetic resonance imaging (BOLD-fMRI) to study brain reorganization in non-human primates has been extremely limited. Here, we show that in monkeys with long-term unilateral lesions of the dorsal columns at cervical levels, tactile stimulation of the chin showed BOLD activation in the deafferented hand region of contralesional area 3b in the post-central gyrus. In a monkey with a partial lesion of the dorsal columns, stimulations of both hand and chin activated the partially deafferented hand region. We also show that the somatotopic organization in the non-deafferented ipsilesional somatosensory cortex remained normal.

Item Type: Article
Subjects: Neurodegenerative Disorders
Neuro-Oncological Disorders
Neurocognitive Processes
Neuronal Development and Regeneration
Informatics and Imaging
Genetics and Molecular Biology
Depositing User: Dr. D.D. Lal
Date Deposited: 08 May 2017 06:55
Last Modified: 21 Feb 2022 05:34
URI: http://nbrc.sciencecentral.in/id/eprint/111

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