PSYC 1200 Lecture 6a
Chapter 9: Intelligence IQ Test
Achievement Tests Measure ‘crystallized’ intelligence or success in acquiring knowledge or skill in some domain.
Tests what you were supposed to have learned already.
Verbal Reasoning: vocabulary, comprehension, absurdities, and verbal relations tests.
Quantitative Reasoning: quantitative, number series, and equation building tests.
Aptitude Tests Measure ‘fluid’ intelligence or the ability to acquire knowledge or skills in the future.
Tests your likelihood of learning new things in the future.
Abstract/Visual Reasoning: pattern analysis, copying, matrices, and paper-folding/cutting tests.
Intelligence Quotient Measure people’s ability to do a range of tasks that seem to require intelligence.
(IQ) Tests Get a score based on their performance and compare that score to everyone else.
Called a standardized test because thousands of people have taken the test and we know the average score across thousands of
people and we know how likely it is to get different scores on the test.
Tasks Performed on IQ Tests: General knowledge questions, recognizing similarities between objects, math problems, knowing
word meanings, knowing what is missing from pictures, assembling puzzles.
Factor Analysis & IQ Method to statistically identify whether some single ability underlies success in performing a number of different tasks.
Tests Using this method suggests there is some general ability (or g factor) that determines performance on IQ Tests.
IQ & Alfred Binet In 1904, French government asked for an objective test to identify children with problems in learning.
(1857-1911) Binet’s solution was to measure mental age (MA) or level of mental development relative to other children of the same age:
Test measured memory, vocabulary, and perception.
Questions varied in difficulty, so that Mental Age could be calculated based on scores on the questions.
Intelligence Quotient (IQ) = Mental Age/Actual Age*100
Disadvantage: Good work by Binet, but did not allow for comparing intelligence in adults.
History of IQ Testing In 1916, Stanford Psychologist Lewis Terman modified Binet’s test for use in North America, and called it the Stanford-
Binet Intelligence Scale, but is still only for measuring children’s IQ.
In 1930’s, David Wechsler designed the first IQ Test for adults, called The Weschler Adult Intelligence Scale (or
WAIS). Standardized so scores are Normally Distributed with an average of 100. So if you score between 85 and 115
your about average. If you score greater than 130, you’re smarter than more than 97% of everyone else.
Later a children’s version was developed Weschler Intelligence Scale for Children (or WISC).
Both WAIS and WISC consist of items testing: vocabulary, arithmetic ability, short-term memory span, judgments of