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Group means of the key-press and key-release timings of the first seven strokes in the pretest (top) and post-test (bottom), with the left hand in the RcLa condition in the expert pianists (left) and nonmusicians (right). A left and right edge of a black horizontal bar corresponds to timing of the key-press and key-release of each stroke, respectively. x-axis and y-axis indicates time and pitch, respectively. Time 0 indicates the moment of the initial stroke.
