Rodent
Gregariousness and fear in laboratory rats
In a novel open-field environment rats showed less signs of fear [number of fecal boluses excreted] when tested in pairs versus alone. The presence of a caged companion was less effective than a free-moving companion in reducing fear.
Year Published: 1969Animal Type: Rat, Rodent
Citation: Latane, B. 1969. Gregariousness and fear in laboratory rats. Journal of Experimental Social Psychology 5, 61-69.
Read MorePaper as a positive reinforcer for acquisition of a barpress response by the golden hamster
A hamster will readily work in order to get access to nesting material.
Year Published: 1969Animal Type: Hamster, Rodent
Citation: Jansen, P. E., Goodman, E. D., Jowaisas, D. et al. 1969. Paper as a positive reinforcer for acquisition of a barpress response by the golden hamster. Psychonomic Science 16, 113-114.
Read MoreEffects of postweaning enrichment and isolation upon emotionality and brain weight in the mouse
At weaning (21 days) 60 male C57BL/6J mice were placed into isolation cages while 60 others were grouped in enriched environments. Fifteen days later half of each group was shifted to the opposite housing condition while the other half continued...
Year Published: 1969Animal Type: Mouse, Rodent
Citation: Denenberg, V. H., Wehmer, F., Werboff, J. et al. 1969. Effects of postweaning enrichment and isolation upon emotionality and brain weight in the mouse. Physiology and Behavior 4, 403-406.
Read MoreRat brain: Effects of environmental enrichment on wet and dry weights
Wet weight of rat cerebral cortex was increased by exposure to an enriched environment [10 or 12 animals in large cage with toys], as compared with standard colony [2 or 3 animals in small cage] or impoverished conditions [single-housing].
Year Published: 1969Animal Type: Rat, Rodent
Citation: Bennett, E. L., Rosenzweig, M. R., Diamond, M. C. 1969. Rat brain: Effects of environmental enrichment on wet and dry weights. Science 163, 825-826.
Read MoreEffects of enriched environment upon hoarding
95 mice from 2 inbred strains were exposed to a postweaning enriched environment or to a standard environment. The design allowed assessment of effects due to environment, genotype, and genotype * environment interactions. Environment enrichment differentially affected hoarding performance in...
Year Published: 1968Topics: Environmental EnrichmentAnimal Type: Mouse, Rodent
Citation: Manosevitz, M., Campenot, R. B., Swencionis, C. F. 1968. Effects of enriched environment upon hoarding. Journal of Comparative and Physiological Psychology 66, 319-324.
Read MoreHousing, care, and breeding
Species-appropriate handling procedures are described/demonstrated.
Year Published: 1968Animal Type: Hamster, Rodent
Citation: Magalhaes, H. 1968. Housing, care, and breeding . In: The Golden Hamster - Its Biology and Use in Medical Research. Hoffman, R. A., Robinson, P. F., Magalhaes, H. (eds), 15-23. Iowa State University Press, Ames, Iowa.
Read MoreSocial and nonsocial attraction in rats
Single rats show a reduction of fear in a strange environment when another - though anesthetized - rat is present.
Year Published: 1968Animal Type: Rat, Rodent
Citation: Latane, B., Glass, D. 1968. Social and nonsocial attraction in rats. Journal of Personality and Social Psychology 9, 142-146.
Read MoreEffect of differential environmental enrichment on brain weight and on acetylcholinesterase and cholinesterase activities in mice
Two inbred strains of mice were used in a replication of the Berkeley rat studies on the cerebral effects of differential environmental enrichment. Those raised in a complex environment and given extensive maze training showed significantly heavier brain weights and...
Year Published: 1968Topics: Environmental EnrichmentAnimal Type: Mouse, Rodent
Citation: La Torre, J. C. 1968. Effect of differential environmental enrichment on brain weight and on acetylcholinesterase and cholinesterase activities in mice. Experimental Neurology 22, 493-503.
Read MoreRats’ preference for earned in comparison with free food
When work demands are not too high, rats prefer earned food to free food.
Year Published: 1970Animal Type: Rat, Rodent
Citation: Carder, B., Berkowitz, K. 1970. Rats' preference for earned in comparison with free food. Science 167, 1273-1274.
Read MoreColonic temperature of rats during handling
When rats are gently handled, their core temperature rises as a stress response.
Year Published: 1970Animal Type: Rat, Rodent
Citation: Briese, E., deQuijada, M. G. 1970. Colonic temperature of rats during handling. Acta Physiologica Latinoamerica 20, 97-102.
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