Adult clip duration
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Description:PDF Abstract Research indicates that the motor action pattern of yawning functions to promote cortical arousal and state change through enhanced intracranial circulation and brain cooling. Because the magnitude of this response likely corresponds to the degree of neurophysiological change, we hypothesized that interspecies variation in yawn duration would correlate with underlying neurological differences. Consistent with these effects, primates tend to have longer and more variable yawn durations compared with other mammals.