a Experiment 1:lifespan b Experiment 2:training a Midline frontal theta 1% Initial 1% 1% 3.40 % Older adults Younger adults 1% Older adult post-training 1% 0.60 -0.45 % -150 % 1% 1% Multitasking training ■Single task training Multitasking Single task No-contact ■No-contact control % training training control 20s30s 40s 50s 60s 70s Initial 1 6 month months b Long-range theta coherence later later Initial 认知训练增强 三三三 Older adults Younger adults Older adult post-training 大脑协同能力 1 5 10 PLV (coherence) Multitasking Single task No-contact training training control认知训练增强 大脑协同能力