Transcranial Direct Current Stimulation tDCS is one from many techniques of electrical head stimulation, which were or are subjected to clinical investigations for testing their mainly antidepressive efficacy, and which do not evoke the excessive stimulation of brain neurones with eliciting of the paroxysmal discharge. Despite the proven effectiveness of the convulsive techniques, amongst them electroconvulsive therapy ECT, investigations over sub(non) convulsive methods were continued. The paper describes and contains a systematisation trial of the sub(non)convulsive techniques applied in the period of past decades in the therapy of psychical disorders. Their clinical effectiveness is low, and investigations over them have mainly a cognitive value.