Response expectancy: Kirsch’s non-state account

Response expectancy is Kirsch’s name for expecting a non-volitional response (a feeling, an automatic movement, a reduction of pain), and then tending to have it. It is a laboratory theory, not a sales script.

Key evidence

Kirsch’s 1985 American Psychologist paper reviews work on placebos, hypnosis, and fear reduction. Response expectancies are defined as expectancies of non-volitional responses. He argues they can generate matching subjective experience, with corresponding behaviour and physiology, and that this is a basic psychological mechanism, not a special magnetic fluid.

The later response-set paper (2000) extends that account: it rejects a uniquely hypnotic altered state and also rejects a pure-compliance explanation. Expectancies play a major, not exclusive, role. The hypnotic context can intensify suggestion because of cultural beliefs about hypnosis.

Suggestion is the older Nancy word. Trance is the folk word this theory declines to treat as a unique state.

Limitations

“Expectancy” is not a licence to say every later clinical trial is only placebo. Those trials are graded on condition pages.

What we don't know yet

How to separate expectancy, rapport, and any remaining “state” variance in a dismantling design is still research, not a slogan.

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