Table 1 Sample characteristics and cognitive performance

Age, years

71.91 ± 5 [61.44–82.29]

Sex, male/female

10/16

Years of education

13.69 ± 2.99 [9–20]

fMRI task accuracy, %

0.8 ± 0.06 [0.71–0.91]

MMSE score (maximum 30)

29.42 ± 0.86 [27–30]

CERAD word list delayed free recall score (maximum 10)

8.83 ± 1.39 [6–10]

Geriatric Depression Scale score

3.23 ± 3.01 [0–10]

APOE ε4 carriers/noncarriers

9/17