Ageing brains put both hemispheres to work on complex tasks.
Larkin
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D000375:Aging / Q000502:physiology*; D001921:Brain / Q000000981:diagnostic imaging; D003071:Cognition / Q000502:physiology*; D006801:Humans; D008568:Memory / Q000502:physiology*; D014055:Tomography, Emission-Computed