Barber and Calverley
Theodore Xenophon Barber (1927–2005) and David Smith Calverley (1937–2008) were American psychologists who studied "hypnotic behaviour". 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 instructions 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.
- Pearce, Jeremy (September 23, 2005). "Theodore Barber Dies at 78; Was Major Critic of Hypnosis". The New York Times. Retrieved 20 January 2010.
- "David S. Calverley, 71". Cape Cod Times. March 22, 2008. Archived from the original on 17 June 2011. Retrieved 20 January 2010.