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Biomedical subjects

R Lore

Publications and source records attributed to R Lore.

7 recordsLinked to original sources
PubMed1977

The influence of females upon aggression in domesticated male rats (Rattus norvegicus).

The aggression of adult male Long-Evans rats (Rattus norvegicus), toward males of the same strain, was tested before and after a 1-week period of cohabitation with a pair of intact females, ovariectomized females, or intact males, comparable to the females in size. Only cohabitation with intact females increased the aggression of resident males against unfamiliary male intruders. Female enhancement of aggression does not appear to be caused by sexual frustration of males, or a function of dominance-subordinance relations, per se. Increased aggression may be mediated by elevated testosterone production associated with mating.

Aggression↗
PubMed1977

Rat societies.

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Aggression↗
PubMed1975

Aggression and social experience in domesticated rats.

Small colonies of rats were established, using adult animals that had either received continuous social experience or had been isolated since weaning. Unfamiliar "intruder" rats--with or without postweaning social experience--were exposed individually to the colonies for a 21-hr. period. Behavioral observations and an assessment of the intruder's physical condition indicated that serious fighting, physical injuries, and large weight losses occurred only when an isolation-reared intruder was placed into a colony of socially experienced rats. These results demonstrate that aggression is a joint function of the rearing history of both the colony and the intruder and that social experience plays an important role in the behavioral development of this species.

Aggression↗
PubMed1975

Depth perception in the rat (Rattus Norvegicus): prepotency of three-dimensional over two-dimensional surfaces.

The descent behavior to two- and three-dimensional surfaces in a depth situation was measured and compared for 45-50 days-old hooded rats. When depth differences between surfaces were controlled, significantly more descents were made to three-dimensional than to the two-dimensional surface. The results suggest that a three-dimensional surface--more representative of an animal's natural terrain--provides a more informative environment for motion parallax than does a two-dimensional one.

Animals↗