The movie shows three excerpts of videos analyzed in this experiment. Each excerpt is at a tempo different from the original song (Everybody, by the Backstreet Boys; 108.7 beats per minute [bpm]). The excerpts include synchronized bouts, periods during which Snowball bobs his head in synchrony with the musical beat for at least 12 consecutive bobs. Current Biology 19(10), published online April 30, 2009.
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