Sexual Behavior: Ultrasonic Postejaculatory Song of the Male Rat

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Science  23 Jun 1972:
Vol. 176, Issue 4041, pp. 1349-1350
DOI: 10.1126/science.176.4041.1349


During the refractory period that follows ejaculation, the male rat regularly emits 22-kilohertz vocalizations. These cease after about three-fourths of the total period has elapsed, and this corresponds to an "absolute refractory period" during which the male cannot spontaneously initiate copulation. Similar 22-kilohertz vocalizations occur in other social contexts, and in general they appear to be desist-contact signals.