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Theodore Xenophon Barber and David Smith Calverley (1965) were psychologists who studied "hypnotic behavior". They measured how susceptible patients were to hypnotic induction. One result of their research was showing that the hypnotic induction was not superior to motivational instructionsin in producing a heightened state of suggestibility . The Barber Suggestibility Scale, a product of their research, measures hypnotic susceptibility with or without the use of a hypnotic induction.

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