placebo effect

a clinically significant response to a therapeutically inert substance or nonspecific treatment (placebo), deriving from the recipient’s expectations or beliefs regarding the intervention. It is now recognized that placebo effects accompany the administration of any drug (active or inert) and contribute to the therapeutic effectiveness of a specific treatment. For example, patients given a placebo to relieve headaches may report statistically significant reductions in headaches in studies that compare them with patients who receive no treatment at all. This term is also used more generally in nonclinical studies to indicate any effect arising from participants’ expectations regarding the study.

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Psychology term of the day

December 23rd 2024

scientific explanation

an account of an event, behavior, or thought that is couched in terms of an established set of scientific principles, facts, and assumptions. Typical forms of explanation may be reductionistic, analyzing a phenomenon into components and describing how they combine to produce the phenomenon; ontogenic, relating the phenomenon to a universal set of developmental stages; empiricistic, describing a phenomenon in terms of the conditions that have been observed to produce it; or metaphoric or categorical, identifying a phenomenon as similar in some important respects to other phenomena already understood. Such an explanation stated systematically is generally known as a theory.