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

The ontogeny of play in rats

Jaak Panksepp · Developmental Psychobiology · 1981 · 539 citations

Life Sciences, Behavioral Sciences, Zoology +16

Endogenous opioids and social behavior

Jaak Panksepp, Barbara H. Herman, Tom Vilberg et al. · Neuroscience & Biobehavioral Reviews · 1980 · 537 citations

Social Sciences, Behavioral Sciences, Psychology +12

The biology of social attachments: opiates alleviate separation distress.

Jaak Panksepp, Barry K. Herman, R. Conner et al. · PubMed · 1978 · 481 citations

Social Sciences, Behavioral Sciences, Psychology +12

Twenty-two kHz alarm cries to presentation of a predator, by laboratory rats living in visible burrow systems

Robert J. Blanchard, D. Caroline Blanchard, Rachel Agullana et al. · Physiology & Behavior · 1991 · 458 citations

Life Sciences, Animal Sciences, Zoology +15

Anticipation of play elicits high-frequency ultrasonic vocalizations in young rats.

Brian Knutson, Jeffrey Burgdorf, Jaak Panksepp · Journal of comparative psychology · 1998 · 449 citations

Life Sciences, Behavioral Sciences, Zoology +17