You have been playing the piano since you were five years old. When asked to play a relatively easy piece, like Chopsticks, you do so with very little effort. During this performance, your is active.

Supplementary motor area.

Explanation: The supplementary motor area occupies the posterior one third of the superior frontal gyrus and is responsible for planning of complex movements. Also the control of movements that are internally generated rather than triggered by sensory events, and the control of sequences of movements.

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answer; thin-slice judgments;