Theories of Intelligence (College Board AP® Psychology): Revision Note

Theories of intelligence

• Intelligence is broadly defined as the ability to learn, understand, and apply knowledge to solve problems

• However, psychologists have long debated whether it is a single general ability or a collection of distinct abilities

  • The definition and measurement of intelligence has been contested throughout history and remains subject to cultural bias and ongoing debate

Spearman's g factor: general intelligence

• In the early 20th century, Charles Spearman proposed that intelligence could be reduced to a single general factor, which he called g (general intelligence)

• Spearman observed that people who performed well on one type of cognitive test tended to perform well on others, suggesting a common underlying mental ability

  • The g factor became the foundation for early IQ testing and remains influential in psychometric research

• One important distinction within general intelligence is between two types:

  • Fluid intelligence: the ability to reason quickly, think flexibly, and solve novel problems without relying on previously learned knowledge

    • E.g. solving a logic puzzle you have never seen before; identifying patterns in abstract shapes

  • Crystallized intelligence: accumulated knowledge and skills built up through experience and learning over a lifetime

    • E.g. vocabulary, general knowledge, the ability to apply expertise in a familiar domain

  • Fluid intelligence tends to peak in early adulthood and decline with age, whereas crystallized intelligence tends to remain stable or even increase with age

• Someone who has a fixed mindset about intelligence believes it is a stable, innate trait that cannot be changed

• This contrasts with a growth mindset, which holds that intelligence can develop through effort and learning

Gardner's theory of multiple intelligences

• Howard Gardner proposed that intelligence cannot be reduced to a single factor

  • Instead he identified multiple intelligences, each representing a distinct way of processing information:

• Gardner argued that traditional IQ tests measure only linguistic and logical-mathematical intelligence

  • This leaves the majority of human abilities unmeasured

• Critics argue that some of Gardner's intelligences (e.g., musical, bodily-kinesthetic) are better described as talents or skills rather than forms of intelligence

Sternberg's triarchic theory of intelligence

• Robert Sternberg proposed a triarchic theory of intelligence, arguing that intelligence can be applied to a wide variety of abilities and situations, not just those measured by traditional tests:

  • Analytical intelligence: the ability to analyze, evaluate, compare, and contrast information. This is the type most closely measured by IQ tests

    • E.g. solving a multiple-choice logic problem

  • Creative intelligence: the ability to generate novel ideas, use experience in innovative ways, and adapt to new situations

    • E.g. inventing a new solution to an old problem; thinking divergently

  • Practical intelligence: the ability to apply knowledge effectively in real-world contexts. This is sometimes called "street smarts"

    • E.g. knowing how to navigate social situations, manage a team, or solve everyday practical problems

• Sternberg argued that people who score highly on IQ tests are not always the most successful in life

  • Practical and creative intelligence are equally important but are rarely captured by standardized tests