Intelligence

Intelligence

1. Thurstone (1938)

   • unable to find evidence for general factor but found seven mental ability factors
     • Verbal comprehension
     • Word Fluency
     • Numerical Ability
     • Memory
     • Induction (problem solving)
     • Spatial Ability
     • Perceptual Speed

2. general vs multiple factor theory

   • similarties
     • Spearman ultimately conceded the involvement of group factors in addition to general and specific factors
     • Thurstone admitted the contribution of a higher-order general factor that incorporated the seven “primary mental abilities” of his basic model

3. Fluid intelligence (gf) ‐loading on the culture‐fair test, inference, induction,  memory span and flexibility of closure

4. Crystallised intelligence (gc) ‐loading on verbal, mechanical, numerical and  social skills factors (the factor of traditional intelligence tests)

5. Visualisation (gv) ‐loads on all skills where visualisation is helpful e.g. spatial orientation Retrieval capacity or general fluency (gr) ‐loading on ideational fluency,  association fluency and irrelevant association test Cognitive speed factor (gs) ‐speed in mechanical performance