Evaluations of combined premotor and supplementary motor cortex lesions on a visually guided arm movement

Gary L. Rea, Timothy J Ebner, James R. Bloedel

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

The kinematics of a visually guided, multi-joint arm movement were examined before and after combined bilateral premotor and supplementary motor cortex lesions. Two rhesus monkeys were trained to move a manipulandum from a start zone to one of three equally spaced target zones and then return to the initial start zone. Various features of the movement trajectory including space error, time error, peak velocity and turnaround time were quantified and analyzed before and after the premotor and supplementary motor cortex ablations. Statistical analysis showed no major differences in the trajectories toward or away from the target between the pre- and postlesion state. The major difference following the ablation was increase in the time spent in the target zone, reflecting an increase in time spent in redirecting the trajectory. Normalization of the movement duration revealed a slight delay in the initial part of the movement. These results suggest the premotor and supplementary motor cortex are involved in redirecting the trajectory and/or obtaining the target zone during the execution of a complex movement.

Original languageEnglish (US)
Pages (from-to)58-67
Number of pages10
JournalBrain Research
Volume418
Issue number1
DOIs
StatePublished - Aug 18 1987

Keywords

  • Arm movement
  • Motor control
  • Premotor cortex
  • Supplementary motor cortex

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