Three-dimensional tuning profile of motor cortical activity during arm movements

Takashi Mitsuda, Paolo Onorati

Research output: Contribution to journalArticle

Abstract

The neural firing activity in the primary motor cortex was modulated to the direction of hand movement. In contradiction to previous reports, a recent study found a non-uniform distribution of preferred directions of neurons while monkeys made center-out reaching movements in a horizontal plane. To re-examine the distribution of preferred directions in three-dimensional space, we recorded the activity of 117 arm-related neurons in the primary motor cortex and electromyographic signals of shoulder and upper arm muscles of a monkey while it performed center-out reaching movements towards 26 target points placed on a sphere-shaped workspace. We found that the distribution of preferred directions of neurons was non-uniform and that it was correlated to muscle activity and arm joint rotations.

Original languageEnglish
Pages (from-to)1477-1480
Number of pages4
JournalNeuroReport
Volume13
Issue number11
Publication statusPublished - Aug 7 2002

Keywords

  • Arm movement
  • Directional tuning
  • Electromyography
  • Neural coding
  • Preferred direction
  • Primary motor cortex
  • Shoulder and upper arm muscles
  • Spherical distribution

ASJC Scopus subject areas

  • Neuroscience(all)

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