Louis Thurstone Info

Thurstone challenged this by proposing that intelligence isn't a single ladder, but a . He used factor analysis to identify what he called Primary Mental Abilities (PMAs) .

| Criticism | Explanation | |-----------|-------------| | | Factor solutions require subjective rotation to achieve simple structure; different rotations can yield different interpretations. | | Overfactoring | Early centroid method could extract too many factors, some not replicable. | | Neglect of hierarchical structure | Later research (e.g., Carroll’s three-stratum model) showed PMAs correlate positively, suggesting a higher-order general factor (g) – which Thurstone initially denied. | | Computational burden | Before computers, centroid factor analysis was tedious; modern methods (principal axis, maximum likelihood) are now standard. | louis thurstone

) : The capacity to perform rapid and accurate arithmetic computations. Spatial Visualization ( | | Overfactoring | Early centroid method could

: Spent most of his career here as a professor, establishing the Psychometric Laboratory. | ) : The capacity to perform rapid