A doctor administers a placebo to Simon and shortly thereafter he feels better.This placebo effect occurs unconsciously and is due to a learning process termed:

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The placebo effect is a phenomenon in which a patient's symptoms are alleviated by a substance or treatment that has no therapeutic effect, but that the patient believes is helpful. This effect is due to classical conditioning, in which the patient learns to associate the placebo with feeling better. The patient's expectation of improvement can activate numerous biological mechanisms, resulting in actual symptom relief.

A Doctor Administers a Placebo to Simon and Shortly Thereafter