- Intervention A 40-Hz visual-auditory stimulation group, Intervention B Random frequency visual-auditory stimulation group, HBP high blood pressure, DM diabetic mellitus, MEP motor-evoked potentials, CMCT central motor conduction time, EEG electroencephalography, T1 T1 weighted, DWI T1 weighted, Diffusion-weighted imaging, DTI diffusion-weighted imaging, BOLD blood oxygen level dependent, CTP computer tomography perfusion, T1 pre-intervention, T2 2Â weeks post-intervention retention, T3 3Â months, T4 6Â months post-intervention follow-up