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Conformity is the change in a person's behavior to align with group norms, even when they disagree with the group. People conform due to two motivations: normative social influence, where they seek acceptance and fear ridicule, and informational social influence, where they believe the group has correct information. Both drive individuals to match group behaviors and values.

Asch's 1950s experiments showed that 76% of participants conformed to group pressure at least once by selecting an obviously incorrect line when confederates gave wrong answers. This phenomenon, called the Asch effect, demonstrates the influence of group majority on individual judgment, even when the correct answer is clear and unambiguous.

Conformity increases with majority size up to approximately seven people. Beyond seven members, conformity levels off and may slightly decrease. This upper limit suggests that adding more group members beyond a certain threshold does not proportionally increase conformity pressure on individuals.

The presence of even one dissenter dramatically reduces conformity rates to near zero. When at least one group member disagrees with the majority, individuals are far more likely to resist group pressure and maintain their own judgment, demonstrating that social support significantly weakens conformity effects.

Public responses increase conformity because individuals fear social judgment and ridicule from others. When responses are private, such as writing answers anonymously, conformity decreases significantly. This distinction explains why government elections use secret voting to prevent coercion and protect individual choice from group pressure.

Normative social influence occurs when people conform to fit in and gain acceptance, driven by concern about others' opinions. Informational social influence happens when people conform because they believe the group possesses correct information, particularly in ambiguous situations. The Asch line task demonstrated normative influence since the correct answer was obvious.

Research shows that conformity rates vary based on participants' age, gender, and socio-cultural background. Additionally, overall conformity rates may have decreased since Asch's original studies, suggesting that historical context and personal demographics significantly influence how likely individuals are to yield to group pressure.