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Total numbers of response calls emitted (A) for playback of 50-kHz as the first stimulus [95.25 ± 33.62 (mean ± SEM)] or as the second stimulus (152 ± 40.07) of WI rats. Latencies after stimulus onset (B): 50-kHz first: 16.04 ± 5.67; 50-kHz second: 24.67 ± 16.19.
