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REPORT

Role of Voluntary Drive in Encoding an Elementary Motor Memory

Human Cortical Physiology Section, National Institutes of Health, Bethesda, Maryland

Submitted 12 February 2004; accepted in final form 11 September 2004

Motor training consisting of repetitive thumb movements results in encoding of motor memories in the primary motor cortex. It is not known if proprioceptive input originating in the training movements is sufficient to produce this effect. In this study, we compared the ability of training consisting of voluntary (active) and passively-elicited (passive) movements to induce this form of plasticity. Active training led to successful encoding accompanied by characteristic changes in corticomotor excitability, while passive training did not. These results support a pivotal role for voluntary motor drive in coding motor memories in the primary motor cortex.

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