Timeline and brief history of representative electrical stimulation techniques in post-stroke motor recovery. Each dot represents one typical finding as shown in Table 1, different color indicates different stimulation modality. x-axis, year in sequence, before 2000, each tick means 20 years, after 2000, each tick means 5 years; y-axis, different electrical stimulation techniques. tES, transcranial electrical stimulation; TMS, transcranial magnetic stimulation; NMES, neuromuscular electrical stimulation; TENS, transcutaneous electrical nerve stimulation; DBS, deep brain stimulation; ECS, epidural cortical stimulation; VNS, vagus nerve stimulation; tDCS, transcranial direct current stimulation; tACS, transcranial alternating current stimulation; EEG, electroencephalogram; rTMS, repetitive TMS; PAS, paired associative stimulation; TBS, theta burst stimulation; CBI, cerebellar brain inhibition; BCI, brain computer interface; DTC, dentatothalamocortical.