Charles Spearman Inferred the Existence of a "G" (Or General)

question 75

Multiple Choice

Charles Spearman inferred the existence of a "g" (or general) factor in intelligence from the observation that

• A) people's scores on intelligence tests correlate highly with measures of the size of their cerebral cortex.
• B) people who score high on a test one day are likely to score high again if they take the same test another time.
• C) people who do well on a test of one kind of intellectual ability generally do well on tests of other kinds also.
• D) the mean score on intelligence tests is the same in all countries.

---

Definitions:

EMG Experiment

A diagnostic procedure involving recording and analyzing electrical activity produced by skeletal muscles.

Tonus

The state of partial contraction or tension in a resting muscle, giving it firmness and elasticity.

Hand Dynamometer

A device used to measure hand grip strength, often used in physical therapy and assessments of muscular function.

Motor Unit Recruitment

The process by which different motor units are activated to produce varying degrees of muscle strength.