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Intelligence &
Achievement

Explore how psychologists define, measure, and debate intelligence: from IQ scores to multiple intelligences and the factors that drive human achievement.

AP Psychology

What Is Intelligence?

Intelligence is the mental capacity to learn from experience, solve problems, and adapt to new situations. Psychologists have debated its exact nature for over a century, but most agree it involves reasoning, planning, abstract thinking, and learning quickly.

A Brief History of Intelligence Testing

1
Alfred Binet (1905): Created the first practical intelligence test to identify French schoolchildren who needed extra help. Introduced the idea of mental age.
2
Lewis Terman (1916): Adapted Binet's test for American use as the Stanford-Binet and popularized the IQ score.
3
David Wechsler (1955): Developed the WAIS (Wechsler Adult Intelligence Scale), the most widely used IQ test today, producing separate verbal and performance scores.

The IQ Score Formula

A child with a mental age of 12 and a chronological age of 10 would score \( \frac{12}{10} \times 100 = 120 \). Modern tests no longer use this ratio; they use a deviation IQ that compares your score to a same-age norm group, with a mean of 100 and a standard deviation of 15.

The Normal Distribution of IQ

100 85 115 70 130 34.1% 34.1% 13.6% 13.6% IQ Score

Major Theories of Intelligence

Spearman
General intelligence (\(g\)): A single underlying factor powers all mental abilities.
Gardner
Multiple Intelligences: Eight distinct types, including linguistic, logical-mathematical, and musical.
Sternberg
Triarchic Theory: Analytical, creative, and practical intelligence work together.

General (\(g\)) vs. Multiple Intelligences

Spearman's \(g\) Gardner's MI
Core idea One general factor underlies all tasks Eight independent intelligences
Evidence Factor analysis shows positive correlations Savants, brain-damage case studies
Measurement Single IQ score Profile of strengths
Criticism Oversimplifies diversity of skills May conflate talents with intelligence

Sternberg's Triarchic Theory

Analytical Problem-solving Creative Novel situations Practical Real-world tasks

Emotional Intelligence

Emotional intelligence (EI), proposed by Peter Salovey and John Mayer and popularized by Daniel Goleman, is the ability to perceive, understand, manage, and use emotions effectively. It predicts success in relationships, leadership, and well-being.

Perceive
Recognize emotions in faces, voices, and art
Understand
Predict how emotions shift and combine
Manage
Regulate your own and others' emotions
Use
Channel emotions to facilitate thinking

Nature vs. Nurture

Genetics Heritability Twin studies Brain structure Environment Education Nutrition Enrichment Interaction Gene-environment

Growth Mindset and Achievement

Carol Dweck's research shows that beliefs about intelligence powerfully shape achievement. A growth mindset (believing abilities can be developed) leads to greater persistence, effort, and ultimately higher performance than a fixed mindset (believing intelligence is set in stone).

Growth Mindset
"I can improve with effort." Embraces challenges, learns from criticism, persists through difficulty.
Fixed Mindset
"I'm either smart or not." Avoids challenges, ignores feedback, gives up easily.

Test Bias & Stereotype Threat

1
Test bias: A test is biased if it systematically over- or under-predicts performance for a particular group (e.g., culturally loaded vocabulary items).
2
Stereotype threat (Steele & Aronson): Awareness of a negative stereotype about one's group can reduce performance on tests, creating a self-fulfilling prophecy.
3
Culture-fair tests: Attempts like Raven's Progressive Matrices minimize language and cultural knowledge to measure fluid reasoning more equitably.

Reliability and Validity

Reliable + Valid Reliable, Not Valid Neither

How to Analyze Intelligence Questions

1
Identify the theory: Is the question about Spearman's \(g\), Gardner's MI, Sternberg's triarchic, or emotional intelligence?
2
Check the test property: Is it asking about reliability (consistency), validity (accuracy), or standardization (norms)?
3
Consider the debate: Nature vs. nurture? Fixed vs. growth mindset? Bias vs. fairness?
4
Eliminate distractors: Watch for answers that confuse similar terms (e.g., "reliability" where "validity" is correct).

Common Mistakes

✕ Confusing Reliability and Validity
A test can be reliable (consistent) without being valid (accurate). Remember: validity requires reliability, but not the reverse.
✕ Equating IQ with Worth
IQ measures a narrow range of cognitive abilities. It does not capture creativity, motivation, social skills, or practical intelligence.
✕ Heritability Misunderstanding
A heritability of 50% does NOT mean 50% of YOUR intelligence is genetic. It refers to variation across a population.

Summary Comparison

Concept Key Figure Core Claim
General intelligence (\(g\)) Spearman One factor underlies all cognitive tasks
Multiple intelligences Gardner Eight independent intelligences
Triarchic theory Sternberg Analytical, creative, practical
Emotional intelligence Salovey & Mayer Perceive, understand, manage, use emotions
Growth mindset Dweck Ability can be developed through effort

Question 1 of 5

Charles Spearman's concept of general intelligence (\(g\)) is BEST supported by which of the following findings?

Question 2 of 5

A student takes the same intelligence test on Monday and Friday and receives nearly identical scores. This demonstrates the test's:

Question 3 of 5

According to Sternberg's triarchic theory, a person who excels at adapting to new environments and solving everyday problems demonstrates which type of intelligence?

Question 4 of 5

Claude Steele's research on stereotype threat demonstrated that:

Question 5 of 5

The finding that identical twins raised apart have more similar IQ scores than fraternal twins raised together most directly supports which conclusion?