Gray Rat Research Articles

Failure by rats to learn a visual conditional discrimination after lateral peristriate cortical lesions

Visual functions of lateral peristriate cortex in the gray rat were behaviorally explored. Three groups of rats were trained: normal controls (N = 6), an operated control (monocular field of the striate cortex) (N = 5), and an experimental group which has lesions in the lateral peristriate cortex (N = 5). All subjects were trained postoperatively on a visual conditional discrimination problem. Lateral peristriate subjects had a significant deficit on pattern discrimination with respect to operated and normal control groups, and failed on the conditional discrimination test. Lateral peristriate cortex appears to have an important role in the acquisition of pattern discrimination, and an essential one in more complex visual tasks, where the association of two visual cues is required to master the problem.

Predation by a Gray Rat Snake on Red-Cockaded Woodpecker Nestlings

Predation by a Gray Rat Snake on Red-Cockaded Woodpecker Nestlings

Striate-peristriate cortico-cortical connections in the albino and gray rat

Striate-peristriate cortico-cortical connections in the albino and gray rat

Runway behavior of the gray rat snake with food and water reinforcement

Two groups of gray rat snakes were given training in an enclosed alleyway. Both groups were maintained on a seven day food and water deprivation schedule. Ss of the experimental group were run to food and water reinforcement. Control Ss were run in the same manner except that there was no reinforcement in the goal box. All Ss received one trial every seven days unless they were moulting. Measures of latency and running time produced diverging curves for the experimental and control groups, due principally to the increase in both measures for the latter group.

Mating of the Gray Rat Snake in Alabama

Mating of the Gray Rat Snake in Alabama

Birth weight in the gray norway rat and the factors that influence it

Birth weight in the gray norway rat and the factors that influence it

Variability of pigmentation in the hypophysis and parathyroids of the gray rat (mus norvegicus)

Variability of pigmentation in the hypophysis and parathyroids of the gray rat (mus norvegicus)

Adrenal Gland in Wild Gray and Albino Rat: Cortico-Medullary Relations.

The wild gray rat (Mus norvegicus) has larger adrenal glands for a given body weight or body length than does the tame albino rat (Mus norvegicus var. albinus).1 In both varieties the females have ...

STREPTOTHRIX IN BRONCHOPNEUMONIA OF RATS SIMILAR TO THAT IN RAT-BITE FEVER

Bronchopneumonia is frequent in the white rat, and occurs also in the gray rat. In the course of a study of this condition, especially as it occurs in the white rat, a streptothrix was found which may be of interest in connection with rat-bite fever in man. Sixty white rats showing acute or chronic bronchopneumonia have been examined. A long, fine, straight or wavy filamentous organism was observed in smear preparations or by dark field illumination in fifty-six. Three lesions in which no organisms were seen were chronic. The organisms are most abundant in acute lesions. It is a gram-negative organism and stains fairly distinctly with carbol-gentian-violet and the Giemsa stain. It is distinguished from cilia by its greater length, more pointed ends and its occasional wavy form. In the dark field I have observed once or twice a slow wormlike motion, and one organism showed a corkscrew motion. They