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The premotor cortex of the monkey

M Weinrich, S P Wise

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience

|September 1, 1982

Summary

The premotor cortex, distinct from the motor cortex (MI), shows neuron activity linked to visuospatial cues and voluntary movements. This suggests a specialized role in sensorimotor processing.

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Area of Science:

Neuroscience
Somatic Motor Control

Background:

The premotor cortex's role in sensorimotor control is debated.
Understanding its distinct functions from the primary motor cortex (MI) is crucial.

Purpose of the Study:

To investigate the functional and cellular differences between the premotor cortex and MI.
To clarify the premotor cortex's distinct contribution to movement control based on visuospatial cues.

Main Methods:

Analysis of single unit activity in relation to limb movements.
Evaluation of microstimulation-evoked movements and neuronal responses to visuospatial signals.
Comparison of cytoarchitectural features between premotor cortex and MI.

Main Results:

Premotor cortex neurons exhibit activity related to voluntary movements, similar to MI.
Premotor cortex shows a higher threshold for microstimulation-evoked movements compared to MI.
A significant population of premotor cortex neurons display activity correlated with visuospatial signal occurrence, not solely movement execution.

Conclusions:

The premotor cortex is a distinct functional area within the somatic sensorimotor cortex.
Its unique neuronal properties support a role in processing visuospatial information for movement guidance.
These findings differentiate premotor cortex from MI, highlighting specialized sensorimotor integration.

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