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. Author manuscript; available in PMC: 2012 Jul 1.
Published in final edited form as: Neuropharmacology. 2011 Apr 21;61(1-2):268–275. doi: 10.1016/j.neuropharm.2011.04.012

Fig 4.

Fig 4

Ultrasonic vocalizations in non-treated naïve animals and comparison of USVs emitted on the first day among naïve, cocaine, and sucrose self-administering animals. (A) 50 kHz USVs did not vary over five days in non-treated control animals during 2 hr sessions. (B) USVs on Day 1 of training were increased in the sucrose and cocaine treated animals compared to non-treated control animals. Total 50 kHz USVs are expressed as mean ± SEM. *Represents significant difference from non-treated control animals (ANOVA followed by LSD test,*P≤0.05).