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J Neurophysiol (September 29, 2004). doi:10.1152/jn.00143.2004
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Submitted on February 12, 2004
Accepted on September 11, 2004

Role of voluntary drive in encoding an elementary motor memory

Alain Kaelin-Lang1, Lumy Sawaki1, and Leonardo G. Cohen1*

1 NINDS - NIH, Human Cortical Physiology Section, Bethesda, MD, USA

* To whom correspondence should be addressed. E-mail: cohenl{at}ninds.nih.gov.

Motor training consisting of repetitive thumb movements results in encoding of motor memories in the primary motor cortex. It is not known if propioceptive 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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