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GMV change over time in mono- and bilinguals in the left IPL. For both language groups, mean GMV and standard error of the mean are depicted for t1 and t2 as well as ΔV, i.e., the mean absolute GMV difference between t1 and t2. The GMV decline over time is significantly steeper in bilinguals. GMV, gray matter volume; IPL, inferior parietal lobule; t1, first time point; t2, second time point.
