Increases in regional brain volume across two native South American male populations.

1 B), 89 of 148 structures (60% of structures, 66% of the cortical gray matter) exhibit a negative trend of volume with age.

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Similarly, in Tsimane males, 25 of 148 structures (17% of structures or 12% of the cortex) exhibit a positive trend of regional volume with age (5 with β s > 0.10 ).

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