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Recently Updated Articles

Otis Gamma / GET

Updated 10 hours ago

This article evaluates the psychometric properties of the Gifted Entry Test (GET), a modernized adaptation of the Otis Gamma (Form EM), using a large online sample (N = 76,009).

General Intelligence (g Factor)

Updated 2 days ago

Explains the g factor (general intelligence): how it emerges from shared variance across cognitive tests, its hierarchical structure, g-loadings, what g is and is not, and why it predicts learning, job performance, and other real-world outcomes.

Army General Classification Test (AGCT)

Updated 2 weeks ago

Explores the Army General Classification Test (AGCT): its history, purpose, renormalization, g-factor validity, and predictive power.

Stability of IQ & IQ Declines With Age

Updated 2 weeks ago

Evidence on the stability of IQ across the lifespan, and how IQ changes with age, including differences between fluid and crystallized abilities, processing speed, working memory, and biological influences.