CH 8 CONT.
Intelligence, what is it?
A lot of disagreement on the definition
Better measured by achievement or aptitude?
Complex or simple brain processes?
The global capacity to think rationally, act purposefully, profit from experience, and deal
with the environment
How is intelligence measured?
Alfred Binet (1857 – 1911)
Developed test to identify French students who needed more educational attention
Emphasized the use of many subtests to calculate an overall score
Intelligence Quotient (IQ)
Binet believed intelligence was tied to age
IQ = (“mental age” / chronological age) x 100
Increase in mental age slows at 16
Today’s tests are based on performance relative to the scores of a large sample of
people the same age
85 – 115 are the 16 & 84 percentiles
o 85 is borderline
o 115 is a gifted intelligence score
70 – 130 are the 2 and 98 percentiles
o 70 is the upper threshold for an intellectual disability
o 130 is the bottom threshold for a genius
Today, intelligence tests measure a variety of things
o General knowledge
o Vocab, memory, math, spatial relationships, logical reasoning, sequencing
One Intelligence or Many?
o Charles Spearman
Subtests on intelligence tests are highly correlated indicating an overall