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Rats were trained in a Skinner Box with food reinforcement and a series (30 days) of 4 successive reinforced bar pressings were given. Latencies were measured for each trial. Results confirmed hypotheses that minimal latency occurred at the second link and maximal latency at the fourth link of...
After a preliminary testing period of 42 days hoarding trials, comparable groups of animals were given anterior, medial or posterior cortical lesions and an additional 30 days of hoarding tests. A suitable sham-operative control group was also used. Results showed that all of the types of...
Rhesus monkeys subjected to extensive unilateral cortical lesions show marked retardation in the acquisition of solution to oddity problems, animals with unilateral occipital resection were not inferior to normal controls. Lesions in the contralateral hemisphere tended to increase the impairment.
Thoracic and lumbar transections of spinal cord in ten cats and one dog at varying ages from 2 days to 12 weeks were followed with post-operative exercise of the hind limbs. Some of the animals showed a recovered ability to walk, run or jump in a coordinated manner. Recovery appeared to be...
A simple shock apparatus utilizing the capacitance of the rat's body is described, together with wiring diagrams and directions for construction.
Tests of hoarding in animals of various ages ranging from shortly after weaning to 318 days of age show a general increase with age, the curve being negatively accelerated. More pellets are hoarded under deprivation than before, but the relationship with age is similar in both instances.
The effect of three types of thyroid treatment on hoarding were studied. Although metabolism was successfully decreased by thiouracil administration or by thyroidectomy and increased by thyroxine injection there was no statistically significant effect of any treatment on hoarding of either...
Rats were trained on a simple T-maze in a homogeneous extra-maze environment, to criterion in a position habit, aided by differential light stimuli via the goal boxes, the brightness ratios between correct and incorrect sides being varied for each of 4 groups of animals. After achievement of...
"Three groups of brain-operated monkeys and one group of unoperated rhesus monkeys were trained on four types of visual discrimination tests. The Frontal Group and the Posterior Group had previously undergone extensive unilateral decortication. In their second operations they suffered lesions of...
Using groups of rats and bar-pressing responses requiring different degrees of effort, the relation between effort and habit strength was investigated. Results indicated that "the more effortful the performance of the task, the better will it be learned." However, with increased effort the time...
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