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Research Article

Human Supplementary Motor Area Contribution to Predictive Motor Planning

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Pages 303-309 | Received 24 Jan 2011, Accepted 20 Apr 2011, Published online: 06 Jul 2011
 

ABSTRACT

The supplementary motor area (SMA) is involved in planning limb movements. An important component of such planning is the prediction of the sensory consequences of action. The authors used transcranial magnetic stimulation (TMS) to probe the contribution of SMA to motor planning during a predictive load-bearing task. Single TMS pulses were delivered over the SMA after a cue instructing the participant to release a platform supporting his or her right hand, which in turn held a 2 kg mass. Participants were less able to bear the load successfully when TMS was delivered 400–500 ms prior to the response. This result suggests that the SMA contributes to the prediction of the sensory consequences of movement well before movement onset.

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