Tai Chi 1 Tai Chi Chuan 1 adult 1 aged 1 article 1 brain plasticity 1 clinical article 1 controlled study 1 exercise 1 exercise intervention 1 female 1 fractional amplitude of low-frequency fluctuation 1 functional magnetic resonance imaging 1 fusiform gyrus 1 human 1 human experiment 1 inhibition control male 1 nerve cell plasticity 1 spontaneous neural activity 1 superior frontal gyrus 1 walking 1 young adult 1