“…Furthermore, if it be conceded that all kinds of psychotherapy may be profitably conceptu alized as processes in learning or conditioning (e.g. 129,130,131,132,133,134,135,136,137,138,139,140) then the use of stimulant and depressant drugs during therapy may also be considered in terms of this rationale. It might be advisable to combine psychotherapy with a depressant drug when it is desired to extinguish a certain learned pattern of behaviour and to combine psycho therapy with a stimulant drug when new learning is being initiated.…”