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Figure 9.15 Gray Matter in Bilinguals
Andrea Mechelli and her colleagues (2004) found that children who were bilingual had increased gray matter
density (i.e., more neurons) in cortical areas related to language in comparison to monolinguals (panel a), that
gray matter density correlated positively with second language proficiency (panel b) and that gray matter density
correlated negatively with the age at which the second language was learned (panel c).