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Higher-order dendritic branching is considerably greater in Golgi-stained neurons from the occipital cortex of rats reared in groups in a complex environment than in similar neurons of littermates reared individually in laboratory cages. Littermates reared in pairs in cages have intermediate amounts of branching, while lower-order branching did not appear to be affected by any rearing environment.
Volkmar et al. (Fri,) studied this question.