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Intracortical Microstimulation Maps of Motor, Somatosensory, and Posterior Parietal Cortex in Tree Shrews (Tupaia Belangeri) Reveal Complex Movement Representations

Resource type
Date created
2017-02-01
Authors/Contributors
Author (aut): Baldwin, Mary K. L.
Author (aut): Cooke, Dylan F.
Author (aut): Krubitzer, Leah
Abstract
Long-train intracortical microstimulation (LT-ICMS) is a popular method for studying the organization of motor and posterior parietal cortex (PPC) in mammals. In primates, LT-ICMS evokes both multi-joint and multiple body-part movements in primary motor, premotor, and posterior parietal cortex. In rodents LT-ICMS evokes complex movements of a single limb in motor cortex. Unfortunately, very little is known about motor/PPC organization in other mammals. Tree shrews are closely related to both primates and rodents and could provide insights into the evolution of complex movement domains in primates. The present study investigated the extent of cortex in which movements could be evoked with ICMS and the characteristics of movements elicited using both short-train (ST) and LT ICMS in tree shrews. We demonstrate that LT-ICMS and ST-ICMS maps are similar, with the movements elicited with ST-ICMS being truncated versions of those elicited with LT-ICMS. In addition, LT-ICMS evoked complex movements within motor cortex similar to those in rodents. More complex movements involving multiple body parts such as the hand and mouth were also elicited in motor cortex and PPC, as in primates. Our results suggest that complex movement networks present in PPC and motor cortex were present in mammals prior to the emergence of primates.
Document
Published as
Baldwin MKL, Cooke DF, Krubitzer L (2017). Intracortical microstimulation maps of motor, somatosensory, and posterior parietal cortex in tree shrews (Tupaia belangeri) reveal complex movement representations. Cerebral Cortex, 27 (2), 1439-1456. DOI 10.1093/cercor/bhv329
Publication title
Cerebral Cortex
Document title
Intracortical microstimulation maps of motor, somatosensory, and posterior parietal cortex in tree shrews (Tupaia belangeri) reveal complex movement representations
Date
2017
Volume
27
Issue
2
First page
1439
Last page
1456
Publisher DOI
10.1093/cercor/bhv329
Copyright statement
Copyright is held by the author(s).
Scholarly level
Peer reviewed?
Yes
Language
English
Download file Size
baldwin_et_al_2018_complex_movement.pdf 3.21 MB

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