The accuracy data yielded a significant main effect of Test Time (F(1,100) = 4.1, p < 0.05, ηp2 = 0.04) and a significant interaction of Test Time × Group (F(2,100) = 3.4, p < 0.05, ηp2 = 0.06). Bonferroni post hoc tests showed reduced error rates at posttest compared to pretest only in the cognitive training group (p < 0.01), but not in the two control groups (both ps > 0.84).
receiving a 4-month multi-domain cognitive training
nothing or receiving a 4-month relaxation training
P3 amplitudes