Stereotypes and Social Perception

Early printing required manual arrangement of individual letters.
The advent of stereotype: Printers developed a method to create a mold (negative) of the laid-out type using latex or paper mache.
Stereotype: A fixed impression or mold used for printing multiple copies.
The term "stereotype" originates from this printing concept, referring to a fixed, unchanging representation.

Stereotypes are preconceived, oversimplified notions about groups.
They are fixed representations that are not easily updated.
Stereotypes can circulate rapidly and be easily disseminated.
Stereotypes can be accurate or inaccurate; the lecture will focus on inaccuracy but also address forces that produce accurate stereotypes.

Introduced as a tool for thinking about psychology and improving understanding.
Proposed by Egon Brunswick.
People possess internal attributes (e.g., being funny, smart, introverted), which are not directly visible.
We infer these attributes based on cues: observable behaviors and characteristics.
Attributes influence behavior, which in turn produces cues.
Cues may or may not be valid indicators of the underlying attribute.
The lens model involves taking in cues and focusing them to make inferences about someone's attributes.
Individuals establish rules and weights for different cues in forming these inferences.

Example used to illustrate the lens model.
Dutch people are, on average, taller than American men by approximately $2.3$ inches.
This height difference has been reliable since after World War II.
Observing people in the Netherlands, one can infer that Dutch people are tall.

Being Dutch is a valid cue for being taller.
Hearing someone is Dutch leads to the inference of them being taller.
This can lead to the stereotype that Dutch men are tall, a valid judgment.
However, if height is used as a cue for intellect, it may lead to invalid judgments, like assuming Dutch people are intelligent without direct observation.

The lens model explains how individuals assemble cues to form summary judgments (stereotypes), which may or may not be valid.
Irrelevant cues may be used, and relevant cues may be ignored.
The model explains how stereotypes are developed from external information and cues.

Stereotypes can form even without decent information about a group.
Interacting with a single person provides a small sample of behavior and limited information about the group mean.
Larger samples lead to more representative and reliable estimates of group traits.
With more data points, there is less noise and unreliability in the estimate.
Stereotypes based on unreliable or insufficient data are likely to be inaccurate.
The mind seeks information about individuals and often uses group membership to simplify assessments.
Personal stereotypes can be significantly off if based on noisy or unreliable data.

Combining information from many people can lead to more accurate estimates.
Individual estimates have noise or error, which is random and cancels out when aggregated.
The estimate consists of the actual answer plus some error, which varies above and below the average.
The errors are random: some people overestimate, and some underestimate.
Averaging many scores reduces the impact of individual errors and approaches the true mean.
Errors are smaller with more high-quality information.
The wisdom of crowds effect suggests that group estimates can be correct even when individual judgments are flawed.
The aggregate estimate is known as the consensual stereotype.

Consensual stereotypes are improved by incorporating evaluations from members of the group itself.
Cosmopolitanism: It requires familiarity with multiple groups.
A crowd can range from two to infinity, with more estimates improving the stereotype.
Good consensual stereotypes require many estimates and exposure to both groups being compared.

Research shows how personalities change predictably with age, providing high-quality information for stereotypes.
Individuals have substantial experience with people of different ages (parents, siblings, grandparents).
A study by Chan et al. (2012) across 26 countries and six continents asked participants to rate adolescents, adults, and older adults on personality traits such as neuroticism, extroversion, openness, agreeableness, and conscientiousness.
The researchers compared these ratings with self-reports from individuals in each age group to assess stereotype accuracy.
Results indicated that consensual stereotypes about age groups align with actual personality differences:
- E.g., adolescents report higher neuroticism than adults.
- Extroversion declines past middle age.
- Agreeableness and conscientiousness increase with age.
The stereotype accuracy reflects the extensive experience individuals have with different age groups.

Stereotypes conform and become consensual even with flawed information due to how cultural information is encoded, remembered, and retrieved.
Information is made memorable by applying rules of thumb, such as associating traits with appearances.
The transmission of information changes it in predictable ways:
- Information becomes simpler.
- Information becomes more structured.
- Information becomes more easily learnable.
- Information appeals to communicators and their audiences.
People are more likely to talk about confidence, agreeableness, and attractiveness.
Information is transmitted based on learnability, not just truth value.
Combining these mechanisms with the tendency to infer invisible characteristics from superficial similarities leads to the cultural evolution of stereotypes.