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The synchronization-perturbation and synchronization-continuation tasks. Stride-based (upper) and step-based (lower) pacing rhythms are indicated by the vertical lines. (a) Phase-delay perturbations. The actual beep (black) comes later than expected according to the rhythm (grey). (b) Phase-advance perturbations. The actual beep (black) comes earlier than expected according to the rhythm (grey). (c) Continuation. The beeps no longer appear.
