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Updated: Jun 27, 2026

Chronic Implantation of Whole-cortical Electrocorticographic Array in the Common Marmoset
Published on: February 1, 2019
Correlations between hand preference and cortical thickness in the secondary somatosensory (SII) cortex of the common
Catherine A Gorrie1, Phil M E Waite, Lesley J Rogers
1Neural Injury Research Unit, School of Medical Sciences, University of New South Wales, Sydney, NSW, USA. c.gorrie@unsw.edu.au
Abstract:
Cortical asymmetries are well established in humans for language and motor regions and correlate with handedness. Here the authors investigate structural differences in the hemispheres of left- and right-handed common marmosets using surface photography and histology. The hand preferences of 11 marmosets were assessed over their adult life span using a simple reaching task. A significant correlation was found between the length of the right lateral sulcus/brain weight and the % right-hand preference (r = .86, p = .001). Cortical thickness on the superior bank of the right lateral sulcus posteriorly was also positively correlated with % right-hand preference (r = .69, p = .025). Comparison of this site with previously published functional maps of the marmoset cortex show this area corresponds to SII, a region involved in tactile processing and somatosensory discriminations. It is suggested that the correlation between SII thickness and right-hand preference would be consistent with the fact that right-handed marmosets are more proactive than left-handers in exploring novel objects by touch. Enlargement of a cortical area involved tactile discriminations could be a precursor to the evolution of right-handedness as a population bias.
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