Is athleticism linked to brain size? Exercise-loving mice have larger midbrains
Is athleticism linked to brain size? Researchers performed laboratory experiments on house mice and found that mice that have been bred for dozens of generations to be more exercise-loving have larger midbrains than those that have not been selectively bred this way -- the first example in which selection for a particular mammalian behavior has been shown to result in a change in size of a specific brain region.
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