Social Impact Theory

The foundational principle of Latané's Social Impact Theory

The total amount of social influence an individual experiences is a direct mathematical function of the strength, immediacy, and number of sources.

The definition of Strength in Social Impact Theory

The perceived status, age, power, or institutional authority of the person delivering the social pressure.

The definition of Immediacy in Social Impact Theory

The direct physical or psychological proximity of the source to the target in terms of space or time.

The definition of Number in Social Impact Theory

The total quantity of sources delivering pressure relative to the absolute number of targets receiving it.

The definition of the Psychosocial Law

The principle that the very first source of social pressure has an enormous impact, but each extra person added offers a diminishing marginal return of influence.

The definition of the Divisional Effect

The principle that social impact is heavily diluted across a group if there are far more targets present than there are sources.

One empirical strength supporting Social Impact Theory

Field studies show zoo visitors obey signs far better when orders are delivered by an immediate, high-status park ranger standing right next to them.

One core weakness of Social Impact Theory

It treats humans as passive receivers of pressure, ignoring active, fluid social interaction and cognitive decision-making.