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Published in: Brain Structure and Function 4/2018

01-05-2018 | Original Article

Sensory properties of the caudal aspect of the macaque’s superior parietal lobule

Authors: Michela Gamberini, Giulia Dal Bò, Rossella Breveglieri, Sofia Briganti, Lauretta Passarelli, Patrizia Fattori, Claudio Galletti

Published in: Brain Structure and Function | Issue 4/2018

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Abstract

In the superior parietal lobule (SPL), the anterior part (area PE) is known to process somatosensory information, while the caudalmost part (areas V6Av and V6) processes visual information. Here we studied the visual and somatosensory properties of the areas PEc and V6Ad located in between the somatosensory and visual domains of SPL. About 1500 neurons were extracellularly recorded in 19 hemispheres of 12 monkeys (Macaca fascicularis). Visual and somatosensory properties of single neurons were generally studied separately, while in a subpopulation of neurons, both the sensory properties were tested. Visual neurons were more represented in V6Ad and somatosensory neurons in PEc. The visual neurons of these two areas showed similar properties and represented a large part of the contralateral visual field, mostly the lower part. In contrast, somatosensory neurons showed remarkable differences. The arms were overrepresented in both the areas, but V6Ad represented only the upper limbs, whereas PEc both the upper and lower limbs. Interestingly, we found that in both the areas, bimodal visual–somatosensory cells represented the proximal part of the arms. We suggest that PEc is involved in locomotion and in the control of hand/foot interaction with the objects of the environment, while V6Ad is in the control of the object prehension specifically performed with the upper limbs. Neuroimaging and lesion studies from literature support a strict homology with humans.
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Metadata
Title
Sensory properties of the caudal aspect of the macaque’s superior parietal lobule
Authors
Michela Gamberini
Giulia Dal Bò
Rossella Breveglieri
Sofia Briganti
Lauretta Passarelli
Patrizia Fattori
Claudio Galletti
Publication date
01-05-2018
Publisher
Springer Berlin Heidelberg
Published in
Brain Structure and Function / Issue 4/2018
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI
https://doi.org/10.1007/s00429-017-1593-x

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