Ultrasonic vocalizations during courtship test.

<p>(a–c) Spectrograms (frequency, kHz * time, s) of courtship songs produced by each genotype. (A) Mean peak frequency during 3 min was higher for the in Cad6−/− group (>75 kHz) than the wild-type group (<75 kHz). (B) Maximum (max) peak frequency was higher for the Cad6−/− group than either the Cad6+/− or wild-type group. (C) The number of calls during 3 min did not differ significantly in the 3 groups. (D) The latency to start calling did not differ significantly in the 3 groups. Error bars represent the SEM.