Cognitive flexibility in adulthood and advanced age: Evidence of internal and external validity. - Richard's, María M.; Krzemien, Deisy; Valentina, Vido; Vernucci, Santiago; Zamora, Eliana V.; Comesaña, Ana; Coni, Ana García; Introzzi, Isabel; García Coni, Ana (Applied Neuropsychology: Adult, 2021)