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The Journal of Neuroscience, July 1, 2002, 22(13):5277-5281

BRIEF COMMUNICATION
Training and Synchrony in the Motor System

Marc H. Schieber

Departments of Neurology, Neurobiology and Anatomy, Brain and Cognitive Science, and Physical Medicine and Rehabilitation, The Center for Visual Science, and The Brain Injury Rehabilitation Program at St. Mary's Hospital, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642

Two monkeys trained for >5 years to perform 12 finger and wrist movements had both a greater prevalence of motor cortex neurons with significant effects in spike-triggered averages and a greater ratio of synchrony effects to pure postspike effects than a monkey trained <1 year to perform six movements. By comparison, stimulus-triggered averages were generally similar in all three monkeys, indicating that the increased prevalence of synchrony in spike-triggered averages was a feature of voluntary motor system activity in the monkeys trained for a longer period of time. Synchronization among neurons with relatively direct connections to spinal -motoneuron pools, including motor cortex neurons, may increase as a repertoire of skilled movements is acquired and practiced during long-term training.

Key words: electromyographic activity; finger; learning; motor cortex; movement; muscle; skill; spike-triggered averaging; training

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Copyright © 2002 Society for Neuroscience  0270-6474/02/22135277-05$05.00/0

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