Not only do these data support the notion of bilingualism contributing to cognitive reserve , thereby compensating for higher levels of brain atrophy .
Also that bilingualism might even postpone the onset of AD symptoms by a dramatic 4 -- 5 years .
Not only do these data support the notion of bilingualism contributing to cognitive reserve , thereby compensating for higher levels of brain atrophy , but also that bilingualism might even postpone the onset of AD symptoms by a dramatic 4 -- 5 years .