York University psychologist Ellen Bialystok tested the cognitive functions of 104 adults aged 30 to 59 and of 50 adults aged 60 to 88, all of whom had similar education and income levels.
Jorkas universitātes psiholoģe Elena Bjalistoka veica kognitīvo funkciju pārbaudes testus 104 personām vecumā no 30 līdz 59 gadiem un 50 personām vecumā no 60 līdz 88 gadiem.