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Pallidal neuron activity during sequential arm movements

H Mushiake1, P L Strick

  • 1Research Service (151), Veterans Affairs Medical Center, Syracuse, New York 13210, USA.

Journal of Neurophysiology
|December 1, 1995
PubMed
Summary
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Neurons in the globus pallidus (GP) show task-dependent activity during sequential movements. Many neurons are specifically active during the remembered (REM) task, some even encoding specific movement phases and sequences.

Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Neuroscience

Background:

  • The globus pallidus (GP) plays a crucial role in motor control.
  • Understanding neural activity during sequential movements is key to deciphering motor behavior.

Purpose of the Study:

  • To investigate the activity of globus pallidus (GP) neurons during sequential pointing movements.
  • To differentiate neuronal activity between visually guided (TRACK) and remembered (REM) tasks.

Main Methods:

  • Recorded neuronal activity in the GP of two monkeys performing TRACK and REM tasks.
  • Analyzed task-dependent neuronal activity, categorizing neurons based on their responses to task conditions and movement sequences.

Main Results:

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  • Two-thirds of task-related GP neurons (155/236) were task-dependent.
  • Over 65% of these task-dependent neurons were REM neurons, showing activity specific to or enhanced during the REM task.
  • Nearly half of REM neurons exhibited phase-specific activity, with some also being sequence-specific within the REM task.

    • Conclusions:

    • GP neurons exhibit significant task-dependent and phase-specific activity during sequential movements.
    • These findings suggest that GP neuronal ensembles may encode the spatio-temporal details of sequential movements, contributing to solving the "serial order of motor behavior problem".