Chapter 6: Diversity Science, Brain Structure, and Social Identity

Vertebrate Brain Structure

consists of the hindbrain, midbrain, and forebrain.

Lower Portions of the Brain

The hindbrain and midbrain (or brainstem), which are evolutionarily older structures (often called the lizard brain) responsible for basic survival functions.

Medulla

A lower brain structure responsible for basic involuntary survival functions such as breathing, swallowing, digestion, and heart rate.

Hypothalamus

A brain structure responsible for regulating the expression of basic drives, commonly referred to as the four Fs.

Thalamus

The brain's relay station that transmits motor and sensory information to the cerebral cortex.

Cerebellum

A brain structure responsible for motor coordination and voluntary movement.

Forebrain (Cerebral Cortex / Neocortex)

The evolutionarily newer upper portion of the brain that accounts for a large proportion of the human brain, responsible for analyzing sensory information, abstract problem-solving, and voluntary actions.

Cortical Wrinkles

Folds on the surface of the brain that increase the surface area available for neurons, thereby expanding neural processing capacity.

Prefrontal Cortex (PFC)

The critical forebrain region responsible for higher-level cognitive functions such as executive function, problem solving, analogical reasoning, inhibitory control, and working memory; it is the last part of the brain to mature at around $25\text{ years}$ of age.

Phineas Gage

A historical case study of a man who survived a $3\text{-foot}$ rod piercing his prefrontal cortex, resulting in profound personality changes such as impaired decision-making, capriciousness, profanity, and animal passions.

Amygdala

A subcortical forebrain structure within the limbic system that regulates emotion and memory, signals threats rapidly, triggers fight, flight, freeze, or fawn responses, and processes emotional recognition in others.

Early Social Categorization

The rapid, automatic neurological processing that starts within $\frac{1}{10}\text{ of a second}$ of encountering another person, initiating categorization, facial recognition, goal-directed attention, and emotion processing.

Novelty Effect

An amygdala response mechanism wherein unfamiliar people or objects trigger a heightened threat response due to a lack of previous exposure.

Individuation Task

A cognitive task condition where participants make individual judgments about each face, resulting in reduced amygdala activation in response to Black faces compared to a categorization task.

Stigma (Goffman, 1963)

An attribute, trait, or mark that sets an individual or group apart socially, physically, or emotionally, reducing them into a tainted and discounted person.

Stigma Based on Social Identity

Stigmatization that targets who a person is or what social category they belong to (such as race or gender), which may be visible or hidden.

Stigma Based on Behavior

Stigmatization targeting what a person does, such as habits, lifestyle choices, or actions like drug use or criminal behavior.

Non-Stigmatized Differences

Distinguishing traits that set an individual apart without being socially devalued or carrying negative stereotypes, though they can still cause discomfort and stress (such as a male elementary school teacher among female colleagues).

Personal Identity

The internalized belief of what makes you an individual, differentiating you from others even if they share your social identities.

Social Identity

An identity rooted in shared characteristics, beliefs, values, goals, race, nationality, or group memberships held in common with others.

Social Categorization (Tajfel & Turner, 1979)

The cognitive component of social identity theory involving the classification of oneself and others into social groups based on traits like race, gender, or religion to navigate the social environment.

Social Identification (Tajfel & Turner, 1979)

The process of adopting the identity, norms, values, and behaviors of a categorized group, which fosters a sense of belonging and enhances self-esteem.

Social Identity Threat

The psychological pressure and anxiety experienced when an individual perceives their social identity is being stigmatized in a particular setting.

Stereotype Threat

The situational predicament where an individual is made aware of negative stereotypes about their group, impairing cognitive processing, working memory, attention, and task performance.

Disruptive Apprehension

A response to stereotype threat consisting of acute anxiety experienced when a person realizes they are in a stereotype-threatening situation, leading to underperformance.

Protective Disidentification

A coping response to stereotype threat where an individual redefines their sense of self to sever the connection between their self-worth and performance evaluations in a given domain.

Macroaggressions

Large-scale, institutional, or systemic discrimination that creates widespread inequality, such as discriminatory housing policies or systemic pay gaps.

Microaggressions

Verbal and nonverbal interpersonal exchanges in which a perpetrator causes harm to a target from a marginalized group, whether intended or unintended.

Microassault

An explicit, conscious derogatory behavioral or verbal attack intended to harm a victim through name-calling, avoidant behavior, slurs, or hate symbols.

Microinsult

Verbal or nonverbal behaviors that convey rudeness, insensitivity, or demean a person's heritage or identity, which are often unconscious (such as repeatedly misgendering someone).

Microinvalidation

Communications or behaviors that exclude, negate, or nullify the psychological thoughts, feelings, or experiential reality of a person from a marginalized group.

Environmental Microaggressions

Micro-level assaults, insults, or invalidations manifested at systemic and macro-environmental levels, such as naming campus buildings after problematic historical figures.

Ethnic-Racial Socialization (Hughes et al., 2006)

The transmission of messages, practices, and beliefs regarding race and ethnicity from parents or guardians to their children.

Proactive Socialization

Parental socialization messages that promote pride, knowledge, and acceptance of one's own culture, which are correlated with higher self-esteem, better school readiness, and reduced distress.

Protective Socialization

Socialization messages designed to prepare children for the discrimination and stigma they may encounter due to their race or ethnicity.

Egalitarian Socialization

Socialization practices centered on teaching children to treat individuals from diverse racial and ethnic backgrounds equally.

Enculturation

The process through which an individual learns and adopts the cultural patterns, beliefs, and practices of their own culture.

Acculturation

The process through which an individual learns, adopts, and adapts to the practices and norms of a new culture.

Acculturative Stress

Psychological distress that arises when navigating conflicting pressures between maintaining one's heritage culture and integrating into a new host society.

Integration (Acculturation Profile)

An acculturation style identified by Berry et al. characterized by high heritage culture maintenance and high involvement in the larger society, associated with the best psychological outcomes.

Diffuse (Acculturation Profile)

An acculturation profile characterized by a lack of commitment, lack of direction, and social isolation, associated with the worst psychological outcomes.

Rejection Sensitivity to Race (RS-Race)

The personality disposition wherein an individual anxiously expects, readily perceives, and intensely reacts to racial rejection in ambiguous social scenarios.

Bias Vigilance

A chronic state of attentiveness to cues that signal immediate or potential discrimination, which expends cognitive and emotional resources.

Attributional Framing

A self-protective coping mechanism where negative feedback is attributed to the evaluator's racial bias rather than internal deficits, thereby shielding self-worth.

Psychological Disengagement

A coping strategy involving discounting negative feedback as biased and devaluing the feedback's relevance to one's self-worth.

Attributional Ambiguity

The psychological uncertainty regarding whether interpersonal interactions or negative evaluations stem from racial prejudice or objective causes.

Social Activism

Confronting the sources, mechanisms, policies, or practices of social bias through organized social movements to challenge the status quo.

Collective Action

Coordinated efforts undertaken with others to bring about social, political, or institutional change.