“4. Psychological contrast was sometimes effective: sudden reversals of tone, for example. For a whole or part of the interrogation period, the interrogator would be extremely friendly, addressing the prisoner formally by first name and patronymic, and promising everything. Suddenly he would [reverse tactics such as threaten violence]. (This worked very, very well with women prisoners.) Or as a variation on this: two interrogators would take turns. One would shout and bully. The other would be friendly, almost gentle. Each time the accused entered the office he would tremble— which would it be? He wanted to do everything to please the gentle one because of his different manner, even to the point of signing and confessing to things that had never happened.”*
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Solzhenitsyn, Aleksandr I.. The Gulag Archipelago (pp. 63-64). Harper Perennial. Kindle Edition.
Aleksandr Isayevich Solzhenitsyn ... (11 December 1918 – 3 August 2008) ... was a Russian novelist, philosopher, historian, short story writer, and political prisoner. One of the most famous Soviet dissidents, Solzhenitsyn was an outspoken critic of communism and helped to raise global awareness of political repression in the Soviet Union (USSR), in particular the Gulag system. | From Wikipedia, the free encyclopedia | https://en.wikipedia.org/wiki/Aleksandr_Solzhenitsyn