9.1 & 9.2

Chapter Nine: Intelligence Testing

9.1 Measuring Intelligence

  • Different approaches to intelligence testing

    • Intelligence testing has a historically checkered past.

    • The relationship between intelligence and societal beliefs has led to controversial practices, such as eugenics and forced sterilization.

Key Learning Objectives (9.1)

  • Learning Objective 9.1 a: Know key terminology associated with measuring and testing intelligence.

  • Learning Objective 9.1 b: Understand the influence of social forces and their negative impact on the history of intelligence research.

  • Learning Objective 9.1 c: Apply the concepts of entity theory and incremental theory to promote success in school.

  • Learning Objective 9.1 d: Analyze reasons and challenges for removing cultural bias from intelligence testing.

Case Study: Leilani Weir

  • Leilani Weir's experience highlights the risks of intelligence testing misapplications.

    • Weir struggled to conceive due to forced sterilization after being misclassified based on her IQ test score.

    • Alberta’s Sexual Sterilization Act allowed for procedures without consent, affecting thousands.

Importance of Accurate Intelligence Measurement

  • Ensuring rigor in psychological research is crucial as the misuse of intelligence testing can have dire consequences.

  • Intelligence lacks objective standards like other measurements (e.g., mass or length); testing must be methodologically sound.

9.2 Understanding Intelligence

  • Intelligence as a Single General Ability vs. Multiple Specific Abilities

    • Intelligence can be viewed as general ability (g) or multiple specific aptitudes (s).

    • Fluid intelligence vs crystallized intelligence are two major types.

Key Learning Objectives (9.2)

  • Learning Objective 9.2 a: Know key terminology related to understanding intelligence.

  • Learning Objective 9.2 b: Understand the distinction between fluid and crystallized intelligence.

  • Learning Objective 9.2 c: Explore intelligence differences between males and females.

  • Learning Objective 9.2 d: Apply knowledge to identify examples of fluid vs. crystallized intelligence.

  • Learning Objective 9.2 e: Assess whether teachers should customize lessons based on learning styles.

Biological, Environmental, and Behavioral Influences on Intelligence

  • Biological Factors: Brain size, the ratio of glial cells to neurons, etc.

  • Environmental Factors: Socioeconomic status, education quality, etc.

9.3 Biological, Environmental, and Behavioral Influences on Intelligence

Key Learning Objectives (9.3)

  • Learning Objective 9.3 a: Know key terminology related to heredity, environment, and intelligence.

  • Learning Objective 9.3 b: Understand different approaches to studying the genetic basis of intelligence.

  • Learning Objective 9.3 c: Apply knowledge of environmental and behavioral effects on intelligence to enhance cognitive abilities.

  • Learning Objective 9.3 d: Analyze beliefs about the intelligence of older children compared to younger siblings.

The Example of Albert Einstein's Brain

  • Einstein's brain was preserved post-mortem to study its unique characteristics.

  • Surprisingly, it was found smaller than average, which led to questions about the relationship between brain size and intelligence.

Social Issues and Intelligence Testing

  • Historical misuse of intelligence tests has led to segregation and oppression, particularly among marginalized groups.

  • The eugenics movement was informed by flawed interpretations of intelligence measurements, reinforcing prejudices against individuals who scored poorly.

Intelligence Testing through Historical Perspectives

  • Historical Context: Early tests were often biased, leading to incorrect diagnoses (such as labeling individuals as “feeble-minded”).

  • Key Figures:

    • Francis Galton: emphasized sensory ability and anthropometric measures.

    • Alfred Binet & Théodore Simon: focused on complex thinking processes to measure intelligence, developing tasks to identify students needing specialized education.

  • Stanford Binet Test: Adapted by Lewis Terman to fit an American context, this test came to be viewed controversially as measuring innate intelligence.

  • Deviation IQ: Used to measure adult intelligence as a score compared with averages for age groups, adjusting for the issue of mental age.

  • Wechsler Adult Intelligence Scale (WAIS): Widely used for adolescents and adults; includes various indices like General Ability Index (GAI) and Cognitive Proficiency Index (CPI).

Summary of Key Concepts from Chapter Nine

9.1 Summary Points

  • Recognition of the social biases inherent within historical intelligence research and the implications of these biases on policy.

  • Case studies illustrate the severe consequences of misapplied intelligence assessments.

9.2 Summary Points

  • Intelligence defined as distinct abilities (fluid and crystallized) has real-world implications.

    • Fluid intelligence (gF): Problem-solving and novel information.

    • Crystallized intelligence (gC): Knowledge acquired from experience.

9.3 Summary Points

  • Recognition of both genetic and environmental factors in influencing intelligence.

  • Affirmation of the complex interplay between individual abilities and societal expectations.

Ethical Implications

  • The case studies underscore the ethical responsibility of psychologists in testing practices, emphasizing the need for accuracy and the careful interpretation of results.

Cultural Bias in Intelligence Testing

  • Many intelligence tests have shown cultural bias, underscoring the need for cultural sensitivity in their development and application.