Locus of Control

Minority Influence

Social influence does not only flow from the majority to the individual. Minorities — small groups or even single individuals — can also shift the views of the larger group through a process called minority influence. Unlike majority conformity, which tends to produce rapid but often superficial change, minority influence typically operates more slowly, producing genuine, private attitude change. Psychologists have identified three key behavioural styles that determine whether a minority is able to exert this kind of influence.

Consistency

Consistency is widely regarded as the most important factor in minority influence. A minority that maintains the same position across time and across members of the group signals confidence and certainty, forcing the majority to take the position seriously rather than dismissing it as random opinion.

Researchers distinguish two types of consistency. Synchronic consistency refers to agreement among minority members at a single point in time — all members saying the same thing simultaneously. Diachronic consistency refers to stability of the minority position over time — repeating the same message across multiple occasions. Both forms signal that the minority is committed and not simply confused or mistaken.

Commitment

Commitment refers to the willingness of the minority to make personal sacrifices or take risks in defence of their position. Moscovici described this through the augmentation principle: when a minority is seen to suffer for their cause — facing social rejection, financial cost, or physical risk — their credibility increases. The majority begins to reason that a position must be genuinely and deeply held if the minority is prepared to pay such a high personal price for it.

Flexibility

Paradoxically, a minority that is completely rigid and unwilling to consider other perspectives tends to be dismissed as dogmatic and extreme. Flexibility means that whilst the minority maintains its core message, it is willing to acknowledge counter-arguments, make reasonable concessions, and engage in genuine dialogue. Nemeth (1986) identified this balance between unwavering consistency on the central position and openness to discussion as the most effective strategy for minority influence.

Moscovici's Blue-Green Slide Study (1969)

Moscovici and colleagues provided the classic experimental demonstration of minority influence. Participants were shown a series of clearly blue slides and asked to name the colour aloud. A minority of two confederates (out of six participants) consistently named the slides "green." When the minority was consistent, real participants were significantly more likely to also call slides green (8.4% of trials) compared to when the minority was inconsistent (1.3%). This demonstrated that a consistent minority can genuinely alter the perceptual judgements of a majority, producing internalised change rather than mere compliance.

Conversion Theory and the Sleeper Effect

Moscovici proposed conversion theory to explain why minority influence operates differently from majority conformity. Exposure to a consistent minority triggers a validation process — the individual privately reconsiders the issue in depth, searching for a way to reconcile the minority view with their own. This tends to produce genuine, internalised attitude change rather than surface compliance. Crucially, this change often builds in private even when no public shift is visible — a phenomenon called the sleeper effect, where minority influence continues to grow over time after the initial contact.

Evaluation

Research support for the importance of consistency is strong: Wood et al.'s (1994) meta-analysis of 97 studies confirmed that consistent minorities reliably produce greater private attitude change than inconsistent ones. However, much of the research uses artificial laboratory tasks (e.g. colour naming), raising questions about ecological validity — it is unclear whether findings generalise to complex real-world issues such as political or ethical debates. Hogg and Vaughan (1998) also argue that research has underestimated the role of social identity: whether the minority is perceived as an in-group or out-group significantly affects their influence.