Experiment #73 · Scientific experiment

Asch's Conformity Experiments

Most people will deny what they see to agree with a group

Solomon Asch · 1951 · Social psychology

First published: S. E. Asch, "Effects of group pressure upon the modification and distortion of judgments", in *Groups, Leadership, and Men*, ed. Guetzkow (1951).

Subjects asked which of three lines matches a reference line answer correctly alone — and incorrectly when confederates unanimously give the wrong answer.

Asch placed a single subject in a group of confederates who unanimously gave obviously wrong answers to simple perceptual questions ("which line matches the reference?"). About 75% of subjects conformed to the group at least once; on average, subjects gave wrong answers on a third of the critical trials. The experiment is the foundational empirical demonstration of normative social influence — people will modify their reported perceptions to match group consensus even when the consensus is plainly wrong. The result bears on epistemology of testimony, the social construction of belief, and the structure of democratic deliberation.

Formulation

Subject with 7–9 confederates view a reference line and three comparison lines; choose which matches. Twelve of eighteen trials are "critical": all confederates give pre-arranged wrong answer. Subjects conform on ~33% of critical trials; ~75% conform at least once.

Compare this experiment

Dimensions Engaged

◎

Observer

Targets Observer · Knowledge Extent and Agency: how much of perception and belief is fixed by independent observation vs by social context?

Responses — How Schools Engage

Affirms / takes the bait 4

Naturalism

A canonical demonstration of how social influence shapes even what subjects take to be direct perception. Foundational for the social epistemology subsequent work has built.

Pragmatism

Confirms the pragmatist commitment to inquiry as essentially social: belief formation is normally collective, and the rare ability to maintain individual judgement against consensus is a culturally formed capacity.

Constructivism

A model case of socially constructed cognition: the perceived "truth" is co-constructed by participants in a way pure-perception models cannot accommodate.

Postmodernism

A neat empirical illustration of the situatedness of "truth": consensus is socially produced even at the level of immediate perception.

Denies / rejects the premise 1

Existentialism

Authentic existence requires standing against the herd; the conforming 75% are demonstrations of bad faith, not of human nature. The case is normative, not descriptive.

Holds it inconclusive 1

Analytic Metaphysics / Logical Atomism

The case bears on social epistemology of testimony: when is deference to group judgement rational? Asch's subjects had decisive perceptual evidence; the rationality of conformity scales with the reliability of the consensus.