WE INVESTIGATED INFLUENCES OF AUDITORY FEEDBACK, musical role, and note ratio on synchronization in ensemble performance. Pianists performed duets on a piano keyboard; the pianist playing the upper part was designated the leader and the other pianist was the follower. They received full auditory feedback, one-way feedback (leaders heard themselves while followers heard both parts), or self-feedback only. The upper part contained more, fewer, or equal numbers of notes relative to the lower part. Temporal asynchronies increased as auditory feedback decreased: The pianist playing more notes preceded the other pianist, and this tendency increased with reduced feedback. Interonset timing suggested bidirectional adjustments during full feedback despite the leader/follower instruction, and unidirectional adjustment only during reduced feedback. Motion analyses indicated that leaders raised fingers higher and pianists' head movements became more synchronized as auditory feedback was reduced. These findings suggest that visual cues became more important when auditory information was absent.

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