Fig. 4.

Changes in cognitive performance during the 18 months follow-up. Figure illustrates changes in cognitive performance at baseline, 6 months and 18 months (higher scores suggest better performance, except stroop interference index) in the training and control group. Training group stopped training during 6 and 18 months. Error bars were standard errors. MMSE, Mini mental state examination; ACER, Addenbrooke's cognitive examination-revised; AVLT, auditory verbal learning test; CFT, complex figure test.