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Rate of USV emissions during 10-min anticipatory and subsequent 4-h access periods. (A) The rate of 50–55 kHz frequency modulated (FM) USVs emitted during the anticipatory period was significantly higher compared to the subsequent 4-h session (p < 0.05). However, there was no difference in this rate between EtOH and control rats. (B) There was no difference in the rate of 22–28 kHz USV emissions between the anticipatory or the 4-h periods, nor between EtOH or water treated rats.
