The primary intelligence theories and their originators include:
‘g’ Factor Theory (A): Spearman introduced the general intelligence (g) factor, highlighting a fundamental cognitive capacity relevant across various tasks (II).
Hierarchical Theory (B): Vernon's hierarchical model connected general intelligence to specific abilities (III).
Multifactor Theory (C): Thurstone identified primary mental abilities, focusing on distinct cognitive areas (IV).
Cubical Model (D): Guilford’s Structure of Intellect model utilized a 3D framework for classifying intellectual abilities (I).