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- W2318541730 abstract "Adolescent rats emit 50 kHz ultrasonic vocalizations, a marker of positive emotion, during rough-and-tumble play or on tickling stimulation. The emission of 50 kHz ultrasonic vocalizations in response to tickling is suggested to be mediated by dopamine release in the nucleus accumbens; however, there is no direct evidence supporting this hypothesis. The present study aimed to elucidate whether play behavior (tickling) in adolescent rats can trigger dopamine release in the nucleus accumbens with hedonic 50 kHz ultrasonic vocalizations. The effect of tickling stimulation was compared with light-touch stimulation, as a discernible stimulus. We examined 35–40-day-old rats, which corresponds to the period of midadolescence. Tickling stimulation for 5 min significantly increased dopamine release in the nucleus accumbens (118±7% of the prestimulus control value). Conversely, light-touch stimulation for 5 min did not significantly change dopamine release. In addition, 50 kHz ultrasonic vocalizations were emitted during tickling stimulation but not during light-touch stimulation. Further, tickling-induced 50 kHz ultrasonic vocalizations were significantly blocked by the direct application of SCH23390 (D1 receptor antagonist) and raclopride (D2/D3 receptor antagonist) into the nucleus accumbens. Our study demonstrates that tickling stimulation in adolescent rats increases dopamine release in the nucleus accumbens, leading to the generation of 50 kHz ultrasonic vocalizations." @default.
- W2318541730 created "2016-06-24" @default.
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- W2318541730 date "2013-03-27" @default.
- W2318541730 modified "2023-10-16" @default.
- W2318541730 title "Tickling increases dopamine release in the nucleus accumbens and 50 kHz ultrasonic vocalizations in adolescent rats" @default.
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- W2318541730 doi "https://doi.org/10.1097/wnr.0b013e32835edbfa" @default.
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