50-kHz chirping (laughter?) in response to conditioned and unconditioned tickle-induced reward in rats: effects of social housing and genetic variables

@article{Panksepp200050kHzC,
  title={50-kHz chirping (laughter?) in response to conditioned and unconditioned tickle-induced reward in rats: effects of social housing and genetic variables},
  author={J. Panksepp and J. Burgdorf},
  journal={Behavioural Brain Research},
  year={2000},
  volume={115},
  pages={25-38}
}
In these studies the incidence of conditioned and unconditioned 50-kHz ultrasonic vocalizations (USVs) in young rats was measured in response to rewarding manual tickling by an experimenter. We found that isolate-housed animals vocalize much more then socially housed ones, and when their housing conditions are reversed, they gradually shift their vocalization tendencies. Isolate-housed animals also show quicker acquisition of instrumental tasks for tickling, and exhibit less avoidance of… Expand
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Tickling induces reward in adolescent rats
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