Table 4. Spectral Measures of Rat Pup USVs.

Measure	Sex	Untreated	Cocaine	Saline
Number of USVs	Male	72.5±19.9	47.2±20.8	25.7±19.0
	Female	36.9±17.0	38.1±19.0	35.8±32.9
Duration (s)	Male	0.066±0.010	0.080±0.011	0.069±0.010
	Female	0.072±0.009	0.070±0.010	0.060±0.017
Inter-USV Interval (s)	Male	2.69±6.03	15.45±6.03	18.61±5.75
	Female	9.22±5.29	10.31±5.75	6.33±9.54
Maximum Frequency (kHz)	Male	51.32±3.1	55.47±3.3	49.86±3.0
	Female	57.73±2.7	52.26±3.0	52.41±5.1
Minimum Frequency (kHz)	Male	49.25±2.9	54.16±2.6	46.97±5.0
	Female	51.21±3.2	47.45±3.0	46.72±2.9
Maximum Amplitude (dBFS)	Male	58.8±1.9	59.1±2.0	53.1±1.8
	Female	55.2±1.7	54.8±1.8	56.8±3.2
Number of Harmonics	Male	1.11±0.12	1.10±0.13	1.08±0.12
	Female	0.86±0.11	1.12±0.12	1.22±0.21

Note: All values are Mean ± SEM.