Later work found these abilities are not completely independent, suggesting a hierarchical model (general + group factors). However, PMA influenced modern intelligence tests (e.g., Woodcock-Johnson, WJ-IV).
Thurstone received numerous awards and honors for his contributions to psychology, including the Distinguished Scientific Contribution to Psychology Award from the American Psychological Association (APA) in 1949. He was also elected as a Fellow of the American Association for the Advancement of Science (AAAS) and served as the President of the APA in 1935. louis thurstone
: Earned a Master's degree in Mechanical Engineering from Cornell University in 1912. Later work found these abilities are not completely
Allowed psychology to move from dichotomous (yes/no) opinions to continuous, measurable attitudes. He was also elected as a Fellow of
Louis Leon Thurstone was an American psychologist and engineer whose work revolutionized the measurement of human intelligence, attitudes, and psychological traits. Rejecting the notion of a single general intelligence factor (g), Thurstone developed and proposed the theory of Primary Mental Abilities (PMA) . He also pioneered methods for attitude measurement (e.g., equal-appearing intervals) and established fundamental laws of comparative judgment . His contributions laid the groundwork for modern psychological scaling, personality assessment, and multivariate statistics.
: Founded the society in 1935 alongside the journal Psychometrika .
: Introduced a mathematical model to measure subjective, unobservable psychological stimuli.
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