In Mark Rosenzweig's study of rats raised in enriched versus impoverished environments, the results suggest that environmental stimulation is important to healthy brain development.

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Rosenzweig's study found that rats raised in an enriched environment had heavier and thicker cerebral cortexes than those raised in impoverished environments, indicating that environmental stimulation is important for healthy brain development.

In Mark Rosenzweig's Study of Rats Raised in Enriched Versus