publication . Article . 1992

Developmental expression of defensive responses during exposure to conspecific adults in preweanling rats (Rattus norvegicus).

Lorey K. Takahashi;
Open Access
  • Published: 01 Jan 1992 Journal: Journal of Comparative Psychology, volume 106, pages 69-77 (issn: 0735-7036, Copyright policy)
  • Publisher: American Psychological Association (APA)
I examined preweanling rats' (Rattus norvegicus) expression of ultrasounds and secretion of ACTH when exposed to unfamiliar adult male rats or to their mothers. Pups at 7 days of age produced similar levels of ultrasonic vocalization near both unfamiliar males and mothers. However, these pups could discriminate familiar from unfamiliar adults because ACTH was significantly higher in pups near adult males than in those near mothers. At 14 days of age, pups avoided adult males but not their mothers; therefore, adult males represented a significant threat. Importantly, 14-day-old rats significantly reduced ultrasound production only when near adult males. Pups at 2...
free text keywords: Psychology (miscellaneous), Ecology, Evolution, Behavior and Systematics, Weaning, Psychology, Sound production, Endocrinology, medicine.medical_specialty, medicine, Animal Vocalizations, Adult male, Internal medicine, Stimulus (physiology), Elevated ACTH
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