Greenough, Withers, and Wallace (1990) compared the brains of rats raised in a rich environment requiring lots of learning and motor behaviour with the brains of rats raised as "couch potatoes."What did the researchers find regarding the cerebellums of the more active rats?

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The researchers found that the cerebellums of the more active rats contained more neuronal connections and dendrites. This suggests that environmental enrichment and increased physical activity can lead to structural changes in the brain that may support learning and motor behaviour.

Greenough, Withers, and Wallace (1990) Compared the Brains of Rats