Laughing Rats? Panksepp & Burgdorf (2000). Behavioural Brain Research. 115, 25-38.
Adolescent and Adult: Signal positive affect?
- Short, chirping 50-kHz ultrasonic call.
- To sex, aggression, play, drug reward, manual tickling.
- Mostly in positive social situations.
- “May be functionally or evolutionarily related to human laughter (p. 26)”