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Spectrograms of the stimuli used in the experiment (Top: RAND-REG; Middle: REG-RAND; Bottom: STEP). Transitions are marked with a solid line in each exemplar. The transition in RAND-REG is not detectable until one regularity cycle has elapsed (i.e., until the pattern starts repeating). This time point is labeled effective transition in the figure. REG (and RAND) patterns were generated anew for each trial.
