Abstract
Three groups of male hooded rats were reared under different conditions from weaning until maturity and were then subjected to three tests. From the results it was concluded that rats with complex visual experience are superior to rats with meagre visual experience in emotional stability, visual form discrimination and generalization and spatial problem-solving. Rats with complex visual experience but meagre motor experience are superior in visual form discrimination to rats with complex visual and complex motor experience but are no different in other respects. The important factor seems to be the relationship between the early ex-perience and the requirements of the task.

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