Abstract
SUMMARY: This article considers the potential value of two bodies of thought arising from work on animals in connection with rehabilitating abnormal behaviour. One deals with the processes of catch‐up and self‐regulation, and the other with optimal periods of learning in development. The ideas about self‐regulation are important because an individual with abnormal behaviour at one stage in development may cease to be abnormal of its own accord. The sensitive period concept in development has often been seen as being opposed to that of possible adult rehabilitation. Much of the animal evidence suggests that the opposition is false.

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