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Rationale Systemic amphetamine (AMPH) administration increases the rate of 50-kHz ultrasonic vocalizations (USVs) in adult rats and preferentially enhances the ‘trill’ subtype; these effects of AMPH critically depend on noradrenergic transmission, but the possible contributions of dopamine are unclear. Objective To assess the role of dopamine in 50-kHz USVs emitted drug-free and following systemic...