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Systemic injection dose-response. (A) 50-kHz USVs across 30-minute recording session on day 7 of cocaine (solid bars) or MDPV (hashed bars) administration. (B-C) Time course of cocaine- or MDPV-elicited 50-kHz USVs in 10-minute time bins. * p < 0.05 against saline control group, Mann Whitney tests. Data for (A) are means ± S.E.M., and data for (B-C) are medians. n's=5-8.
