A previous paper (Lippold and Redfearn, 1964) described various mental changes which occur when small direct currents are passed through the brain in human subjects. Some beneficial effects often followed this procedure and it appeared worthwhile to carry out a controlled double-blind clinical trial.
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Costain et al. (1964) studied this question.
Synapse has enriched 2 closely related papers on similar clinical questions. Consider them for comparative context: