Leon Festinger introduced the theory of cognitive dissonance in 1957. The theory suggests that individuals experience psychological discomfort when they hold two or more contradictory beliefs, or when their behavior conflicts with their beliefs. To alleviate this tension, people are motivated to change their attitudes, beliefs, or behaviors to restore internal consistency.

The subjective dimension of deviance refers to the social construction of what is considered 'deviant.' It is not an inherent quality of an act but rather a reflection of societal norms, cultural values, and collective moral judgments. Because these perceptions vary across different cultures and time periods, the subjective dimension highlights that deviance is defined by how a community perceives and reacts to specific behaviors.

Darley and Gross (1983) conducted a classic study on social perception. They showed that participants' expectations, influenced by social class schemas, led them to interpret ambiguous information about a student's performance in a biased way. This demonstrated how schemas significantly affect the encoding and retrieval of information in memory, leading to confirmation bias.

Social psychology is the scientific study of how the thoughts, feelings, and behaviors of individuals are influenced by the actual, imagined, or implied presence of others. It examines social interaction, group dynamics, and the impact of social situations on individual psychology, distinguishing it from sociology which focuses more on group structures and societal institutions.

Stereotype threat occurs when individuals feel at risk of confirming negative stereotypes about their social group. In this case, the athlete's awareness of age-related stereotypes creates anxiety that consumes cognitive resources, leading to a self-fulfilling prophecy where his performance suffers due to the pressure of the perceived stereotype.

Research in social psychology often highlights a discrepancy between objective time spent on chores and subjective perceptions of fairness. Studies have suggested that wives often perceive that they perform a significantly larger portion of the household labor, such as two-thirds, while perceiving their partners as contributing only one-third, even when actual time logs show more parity.

Research suggests that while males often utilize direct physical aggression, females are more likely to employ indirect or relational aggression. These differences may stem from a combination of biological, social, and developmental factors. When the definition of aggression is broadened to include relational harm, the perceived gap in aggressive behavior between genders narrows significantly, highlighting the importance of context and measurement in psychological studies of gender differences.

Research in social psychology consistently links environmental and situational factors like high temperatures (heat), frustration, and direct provocation to increased levels of aggression. Conversely, self-esteem is a measure of self-worth and is not a direct cause of aggression; in fact, high self-esteem is often associated with prosocial behavior rather than aggression.

Cognitive dissonance theory posits that individuals experience psychological discomfort when their actions are inconsistent with their beliefs. To resolve this tension, people often modify their attitudes to be more congruent with their past behavior. This process of rationalization helps restore internal consistency and reduces the mental stress associated with the contradiction, as individuals seek to maintain a coherent self-concept.

An attitude is a psychological construct representing an individual's degree of favor or disfavor toward an entity. It integrates cognitive beliefs, affective feelings, and behavioral tendencies. Unlike cognition, which refers to the process of acquiring knowledge, or behavior, which refers to observable actions, an attitude serves as an evaluative summary that guides how we respond to the world around us.