Comparison of neuronal activity in the rostral supplementary and cingulate motor areas during a task with cognitive and motor demands

A number of cortical motor areas have been identified on the medial wall of the hemisphere in monkeys. However, their specific role in motor control remains unclear. In this study, we sought to describe and compare the functional properties of the presupplementary (pre‐SMA) and rostral cingulate (CM...

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Veröffentlicht in:The European journal of neuroscience 2002-03, Vol.15 (5), p.887-904
Hauptverfasser: Akkal, D., Bioulac, B., Audin, J., Burbaud, P.
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Bioulac, B.
Audin, J.
Burbaud, P.
description A number of cortical motor areas have been identified on the medial wall of the hemisphere in monkeys. However, their specific role in motor control remains unclear. In this study, we sought to describe and compare the functional properties of the presupplementary (pre‐SMA) and rostral cingulate (CMAr) motor areas in two monkeys performing a visually instructed, delayed, sequential movement. We recorded 134 task‐related neurons in the pre‐SMA and 149 in the CMAr. The main difference between the two areas was the abundance of responses to targets (46%) in the pre‐SMA, while CMAr activity was more related to reward (28%). Neuronal responses to targets were more phasic and higher in frequency in the pre‐SMA than in the CMAr. During the delay, the percentage of neuronal responses was similar in the two areas. The discharge pattern was different depending upon whether the delay duration was fixed or variable but in most neurons was the same regardless of the sequence performed. Movement‐related changes were common in the pre‐SMA (75%) and in the CMAr (81%) but they occurred earlier in the former. Neurons activated exclusively during movement were more numerous in the CMAr. Finally, neuronal activity in the pre‐SMA was more related to the sequential aspect of the task compared to the CMAr. Our results suggest that although the two areas share functional properties, they also participate in different aspects of motor behaviour. Their functional properties reflect their anatomical positions, which give them the potential to integrate external stimuli (pre‐SMA) and internal states (CMAr) during motor planning.
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However, their specific role in motor control remains unclear. In this study, we sought to describe and compare the functional properties of the presupplementary (pre‐SMA) and rostral cingulate (CMAr) motor areas in two monkeys performing a visually instructed, delayed, sequential movement. We recorded 134 task‐related neurons in the pre‐SMA and 149 in the CMAr. The main difference between the two areas was the abundance of responses to targets (46%) in the pre‐SMA, while CMAr activity was more related to reward (28%). Neuronal responses to targets were more phasic and higher in frequency in the pre‐SMA than in the CMAr. During the delay, the percentage of neuronal responses was similar in the two areas. The discharge pattern was different depending upon whether the delay duration was fixed or variable but in most neurons was the same regardless of the sequence performed. 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subjects Action Potentials - physiology
Animals
Brain Mapping
Cognition - physiology
Cues
Electric Stimulation
Electromyography
Female
Forelimb - innervation
Forelimb - physiology
Gyrus Cinguli - cytology
Gyrus Cinguli - physiology
Macaca mulatta
Macaca mulatta - anatomy & histology
Macaca mulatta - physiology
motor control
Motor Cortex - cytology
Motor Cortex - physiology
Movement - physiology
Muscle Contraction - physiology
Muscle, Skeletal - innervation
Muscle, Skeletal - physiology
Neural Pathways - cytology
Neural Pathways - physiology
Neurons - physiology
Photic Stimulation
Psychomotor Performance - physiology
Reaction Time - physiology
rostral medial wall
Saccades - physiology
unit recordings
title Comparison of neuronal activity in the rostral supplementary and cingulate motor areas during a task with cognitive and motor demands
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