Abstract
Weanling rats (20–21 days old) and adult rats (55–70 days old) were submitted to conditioning and to pseudoconditioning tests in a shuttle-box. The young animals made less conditioned avoidance responses than the adults in an acquisition session and in addition they showed no retention of these responses. Performance of pseudoconditioned shuttling was similar in both groups. The younger rats made more intertrial crossings in both tests and more orienting responses to the buzzer during pseudoconditioning than the adults. Since in 20- to 21-day-old rats the hippocampal system is not fully mature, the present data agree with existing hypotheses which attribute to this structure a role both in inhibition and in learning and memory consolidation. It is possible, however, that behavioral differences between weanling and adult rats may be due to biochemical or physiological differences in other regions of the brain.
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