Performance characteristics of maze learning in mice selected for high and low brain weight.

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Abstract
Mice selected for high and low brain weight were tested in the Lashley type III maze for differences in rate of learning and type of response pattern, at 2 ages, with water or saccharin reinforcement. There were no differences in standard learning measures between the brain-weight lines. The lines differed in the nature of their response patterns as a function of age (weanling or adult) and type of reinforcement. The brain-weight lines characteristically differ in their response to a reinforcer not clearly dependent on need state (saccharin) and in their performance pattern at different developmental periods.

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