Arthur Jensen: Consensus and controversy

Abstract

Arthur Jensen’s research program centers on the contention that general intelligence (g) is a highly heritable, biologically based trait that accounts for the majority of variance in cognitive performance and long-term social outcomes. The distinction between Level I associative learning and Level II conceptual reasoning provides a framework for analyzing group differences in educability, proposing that disparities in scholastic achievement reflect real phenotypic differences rather than systemic test bias. Psychometric evidence from both internal item analysis and external predictive validity suggests that standardized tests function equivalently across diverse racial and socio-economic groups. Furthermore, mental chronometry research links information-processing speed to psychometric intelligence, reinforcing the construct validity of g as a measure of neural efficiency. While behavioral genetics data consistently implicate heredity as a primary driver of individual IQ variation, the persistent failure of large-scale compensatory education programs suggests that cognitive differences remain resistant to traditional environmental interventions. Educational reform must therefore shift from attempting to equalize cognitive outcomes to optimizing instructional techniques for diverse patterns of mental ability. This multifaceted inquiry into differential psychology highlights the ongoing tension between empirical findings regarding human inequality and egalitarian social objectives. – AI-generated abstract.