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A metronome ticking at a rate of two or three times a second is perceived as an integral sequence, as a rhythm. When the ticks are less frequent, though, say at intervals of three seconds, the sounds appears to be no longer perceived as a sequence in the same way, and each sound impulse remains an isolated perceptual event. Similar results occur with slowed down speech or music: music or spoken sentences are only recognizable as such when their rhythmic patterns and phrases are presented at an optimal speed that allow them to be recognized as a perceptual unity.