Ch7-IntellectualAndCognitiveMeasures (1)

Defining Intelligence

  • Definition: Intelligence is the global capacity to act purposefully, think rationally, and deal effectively with the environment.

    • David Wechsler, 1939

  • Involves:

    • Reasoning, planning, problem-solving, abstract thinking, comprehension of complex ideas, quick learning, and learning from experience.

    • Not limited to academic skills or test-taking abilities, reflects a broader capability for understanding the environment.

    • Gottfredson, 1997

Range of Cognitive Abilities

  • Key elements:

    • Problem-solving, reasoning, learning, adaptation, and understanding complex ideas.

    • Emotional intelligence, social intelligence, creativity, and practical skills.

  • Broad definition: Recognizes diverse cognitive abilities beyond traditional academic metrics.

  • Narrow definition: Focuses on specific skills measured by standardized tests.

Theories of Intelligence

  • Factor Models:

    • Two or more factors at a similar structural level.

  • Hierarchical Models:

    • Different levels of factors, primary composed of secondary factors.

  • Information Processing Models:

    • Processes and operations used in handling information in the brain.

  • Key Theorists and Models:

    • Spearman’s ‘g’ and ‘s’, Thurstone's Primary Abilities, Guilford's factors, Cattell’s fluid vs. crystallized intelligence, Carroll’s three-stratum model, Sternberg’s triarchic theory, Gardner’s multiple intelligences.

Spearman’s Two-Factor Model

  • Proposed that all intellectual activities share a common core, known as the general factor (g).

  • Acknowledgement of specific factors (s) contributing to unique performances.

Thurstone’s Primary Mental Abilities

  • Introduced an alternative to Spearman, identifying primary mental abilities: spatial, perceptual, numerical, memory, verbal, and reasoning.

  • Small overlaps contribute to Spearman’s g.

Cattell’s Fluid and Crystallized Intelligence

  • Developed a hierarchical model:

    • Fluid Intelligence: Innate ability to solve novel problems.

    • Crystallized Intelligence: Knowledge acquired from life experiences and education.

Carroll’s Three Stratum Theory

  • Organized cognitive abilities into three hierarchical levels.

Sternberg’s Triarchic Theory

  • Involves three elements:

    • Componential: Planning, monitoring, evaluating (executive functioning).

    • Experiential: Task novelty or unfamiliarity's influence.

    • Contextual: Interaction with the environment through adaptation, alteration, or selection.

Gardner’s Multiple Intelligences

  • Proposes various forms of intelligence:

    • linguistic, musical, logical-mathematical, spatial, bodily-kinesthetic, intrapersonal, interpersonal, naturalist, spiritual, existential, and moral.

Clinical Reasons for Intellectual Testing

  • Diagnosing and monitoring dementia, brain damage, developmental problems, academic problems, access to programs and services, treatment planning, employment suitability.

Theories Versus Tests

  • Many common tests do not encompass the broad range of abilities modern theories suggest.

  • Low content validity leads clinical psychologists to view scores as estimates of intelligence rather than definitive measurements.

Wechsler’s Tests

  • Developed the Wechsler intelligence tests, widely used among psychologists.

  • Types of Wechsler Tests:

    • Wechsler Adult Intelligence Scale (WAIS)

    • Wechsler Intelligence Scale for Children (WISC)

    • Wechsler Preschool and Primary Scale of Intelligence (WPPSI)

Features of Wechsler Tests

  • Administered one-on-one, requiring extensive training.

  • Subtests are short and incrementally difficult.

  • Tests replaced the verbal/performance split with factor-based assessments.

  • Index Scores:

    • Verbal Comprehension Index (VCI), Perceptual Reasoning Index (PRI), Working Memory Index (WMI), Processing Speed Index (PSI).

  • Scores compared with a normative sample of the same age.

  • Applications in clinical assessments, developmental disorders, giftedness, and vocational planning.

Limitations of Wechsler Scales

  • Cultural bias, limited definition of intelligence, age-related ceiling effects, time-consuming administration, and subjective scoring elements.

Administration and Interpretation Issues

  • Extensive training needed for assessors.

  • Performance feedback is prohibited during tests.

  • Administration complexity and error-prone scoring.

WAIS-IV Example

  • Composed of 15 subtests with increasing difficulty.

  • Scaled scores converted to composite scores.

Indexes of WAIS-IV

  • Interpretation strategy: Examine FSIQ, then Index scores, and finally subtest scaled scores.

  • Significant discrepancies could indicate pathology or cognitive issues.

Intelligence Quotient (IQ)

  • Calculated as IQ = (Mental Age / Chronological Age) * 100.

  • Wechsler introduced standard scoring based on a normal curve.

Correlates of IQ

  • Intelligence correlates with heritability, environmental effects, and lifestyle factors such as exercise and education.

  • Overview of socioeconomic impact on IQ scores and effects of stereotypes on performance.

Normative Base for Intelligence Testing

  • Norm samples provide a comparative basis for assessing individual IQ scores.

  • Various tests are normed to represent the population accurately.

Other Cognitive Tests

  • Expanded upon different tests like the Stanford-Binet, Kaufman assessments, and cognitive scales such as WIAT and WMS-IV.

Achievement vs Intelligence

  • Achievement refers to what a person has accomplished academically, while intelligence tests gauge potential cognitive ability.

  • Learning disorders evaluate discrepancies between a person's achievement and expected levels.

Neuropsychological Testing

  • Targets assessments for brain function problems, shifts from fixed to flexible testing batteries based on individual needs.

Full Neuropsychological Batteries

  • Key examples: Halstead-Reitan, Luria-Nebraska, NEPSY-II, each serving specific populations ranging from adults to children.

Brief Neuropsychological Measures

  • Common tools include Bender-Gestalt, Rey-Osterrieth, RBANS, and WMS-IV, focusing on assessing various cognitive functions.