Raymond Cattell
David Weschler
Lewis Terman
L.L. Thurstone
William Stern
Sir Francis Galton
Charles Spearman
Alfred Binet
I created the formula to compute ratio I.Q. be dividing mental age over chronological age and multiplying by 100.
I shifted attention away from the g-factor to focus on the 7 primary mental abilities such as spatial ability, perceptual speed and verbal comprehension.
I believed sensitivity to high-pitched sounds and skull size would be good predictors of I.Q. I also coined the term Nature versus Nurture.
I modified the original Binet test for use with an American population and conducted longitudinal research on individuals with IQ scores over 135 who became known as the "Termites".
I created the concept of g-factor to underlie general intelligence and the statistical method of factor analysis.
Added a performance scale to IQ tests including tasks like block construction and sequencing of a story.
I am frequently cited as creating the first modern day I.Q. test to determine if French children were prepared to start school.
I created the concepts of fluid intelligence which deals with capacity and speed of information processing and learning novel tasks and crystallized intelligence which relates to hard factual information.
