Distribution of hand location in monkeys during spontaneous behavior

Michael S.A. Graziano, Dylan F. Cooke, Charlotte S.R. Taylor, Tirin Moore

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


Recently it was shown that electrical stimulation of the precentral gyrus of monkeys can evoke complex, coordinated movements. In the forelimb representation, stimulation of each site caused the arm to move to a specific final posture, and thus the hand to move to a location in space. Among these stimulation-evoked hand locations, certain regions of the hand's workspace were more represented than others. We hypothesized that a similar non-uniform distribution of hand location should be present during a monkey's spontaneous behavior. The present study examined the distribution of hand location of monkeys in their home cages. This distribution was similar to that found by stimulation of the precentral gyrus. That is, arm postures that were over-represented in spontaneous behavior were also over-represented in the movements evoked by cortical stimulation.

Original languageEnglish (US)
Pages (from-to)30-36
Number of pages7
JournalExperimental Brain Research
Issue number1
StatePublished - Mar 2004

All Science Journal Classification (ASJC) codes

  • General Neuroscience


  • Grasping
  • Motor cortex
  • Posture
  • Reaching


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