Rat

Effects of enriched and restricted early environments on the learning ability of bright and dull rats

The bright animals reared in enriched environments [group-housing with numerous enrichment gadgets] showed no improvement in learning ability over bright controls reared under normal laboratory condition [group-housing in barren cage]. The dull animals, on the other hand, benefited greatly from...

Year Published: 1958Animal Type: Rat, Rodent

Citation: Cooper, R. M., Zubek, J. P. 1958. Effects of enriched and restricted early environments on the learning ability of bright and dull rats. Canadian Journal of Psychology 12, 159-164.

An experimental investigation of the role of social experience in the production of gastric ulcers in hooded rats

Rats in a chronic approach-avoidance conflict situation alone had significantly greater resultant ulceration than animals tested together.

Year Published: 1957Animal Type: Rat

Citation: Conger, J. J., Sawrey, W. L., Turrell, E. S. 1957. An experimental investigation of the role of social experience in the production of gastric ulcers in hooded rats. American Psychologist 12, 410 (Abstract).

Influence of gentling on physiology of the rat

Handled animals tended to have greater skeletal length than control animals.

Year Published: 1956Animal Type: Rat, Rodent

Citation: Ruegamer, W. R., Silverman, F. R. 1956. Influence of gentling on physiology of the rat. Proceedings of the Society for Experimental Biology and Medicine 92, 170-174.

Environmental factors influencing gonadotrophin assay in the rat

The variation in ovary weight (test response) was greater if the cages were small, if there was frequent disturbance by changing cages and cage-mates, and if the rats were caged either singly or in groups larger than two, with the...

Year Published: 1956Animal Type: Rat, Rodent

Citation: Chance, M. R. A. 1956. Environmental factors influencing gonadotrophin assay in the rat. Nature 177, 228-229.

Socially facilitated reduction of a fear response in rats

The presence of a conspecific mediates fear responses to a stressful situation.

Year Published: 1955Animal Type: Rat

Citation: Davitz, J. R., Mason, D. J. 1955. Socially facilitated reduction of a fear response in rats. Journal of Comparative and Physiological Psychology 48, 149-151.

Physiological damage under emotional stress as a function of early experience

Male Wistar rats were gentled for 10 minutes per day for 21 days, beginning when they were 23 days old. A control group was not gentled. At 44 and 79 days old, gentled rats weighe sginificantly more. All rats were...

Year Published: 1954Topics: Human-Animal InteractionAnimal Type: Rat

Citation: Weininger, O. 1954. Physiological damage under emotional stress as a function of early experience. Science 119, 285-286.

The reward value of running activity

Year Published: 1954Animal Type: Rat, Rodent

Citation: Kagan, J., Berkun, M. 1954. The reward value of running activity. Journal of Comparative and Physiological Psychology 47, 108.

Some effects of maintenance luminance and strain differences upon self-exposure to light by rats

The different degrees of illumination in laboratories may be one of the explanations for variation in experimental results.

Year Published: 1962Animal Type: Rat, Rodent

Citation: Lockard, R. B. 1962. Some effects of maintenance luminance and strain differences upon self-exposure to light by rats. Journal of Comparative and Physiological Psychology 55, 1118-1123.

Effects of environmental complexity and social groupings upon the modification of emotional behavior

Environmental enrichment reduced open-filed defecation in rats.

Year Published: 1962Topics: Environmental Enrichment, Social Housing & CompanionshipAnimal Type: Rat, Rodent

Citation: Denenberg, V. H., Morton, J. R. C. 1962. Effects of environmental complexity and social groupings upon the modification of emotional behavior. Journal of Comparative and Physiological Psychology 55, 242-246.

Some effects of free and restricted environmental rearing conditions upon adult behavior in the rat

Environmental enrichment enhances the exploratory drive.

Year Published: 1960Animal Type: Rat, Rodent

Citation: Woods, P. J., Ruckelshaus, S. I., Bowling, D. M. 1960. Some effects of free and restricted environmental rearing conditions upon adult behavior in the rat. Psychological Reports 6, 191-200.