How moods, stereotypes and social systems shape what people think and do

Key ideas

Affective state

Mood seeps into judgment. In Forgas's affect infusion model, judgments that call for heuristic or substantive, constructive thinking are the most colored by current mood, while retrieving a view one already holds, or judging with a strong goal of reaching a set conclusion, is less affected.

Cognitive dissonance

When people freely act against their own attitude with little outside justification, they tend to shift the attitude toward the act. In Festinger and Carlsmith's classic study, people paid a small sum to call a dull task interesting later rated it more enjoyable than people paid a large sum.

Stereotype threat

Being at risk of confirming a negative stereotype about one's group can lower performance on the task the stereotype concerns. Steele and Aronson found it when a test was framed as a measure of ability, and a meta-analysis found the same pattern for older adults on cognitive tasks.

Racism and minority stress

Reported racism is linked to poorer mental and physical health; a meta-analysis of 293 studies found the strongest links with outcomes such as depression and anxiety. Minority stress theory describes how prejudice events, expected rejection, concealment and internalized stigma add stress for sexual minorities.

Individual and societal systems

Structural stigma means societal conditions, cultural norms and institutional policies that limit the opportunities, resources and well-being of stigmatized groups. Research links it to concealment, rejection sensitivity, weaker effects of psychological interventions and poorer health, so a person's beliefs and coping are partly products of the system.

Worked example

A memory clinic's intake script tells every patient over 65 that the next test "checks for the memory decline that comes with age." A psychologist reviewing the clinic's procedures notices that older patients often arrive anxious and apologize for their memory before any testing begins.

1. Identify the social factor: the script makes a negative age stereotype salient just before a cognitive task, the conditions under which age-based stereotype threat effects appear most reliably.
2. Consider the affective state it creates: anxiety at intake may also color patients' own ratings of their memory, since self-judgments that require constructive thinking are open to mood.
3. Change the clinic's intake wording, not the tests' standardized instructions: describe the session neutrally, without linking it to age or decline.
4. Track whether patients' distress and the pattern of results change, rather than assuming the new wording worked.

Before treating a score or a belief as a plain fact about a person, ask what the setting has led them to think about themselves.