Performance on temporal information processing as an index of general intelligence

The relation between general intelligence (psychometric g) and temporal resolution capacity of the central nervous system was examined by assessing performance on eight different temporal tasks in a sample of 100 participants. Correlational and principal component analyses suggested a unitary timing mechanism, referred to as temporal g. Performance on single temporal tasks and individual factor scores on temporal g were substantially correlated with factor scores on psychometric g. Additional stepwise multiple regression analysis and commonality analysis showed that performance on temporal information processing provides a more valid predictor of psychometric g than traditional reaction time measures derived from the Hick paradigm. Findings suggest that temporal resolution capacity of the brain as assessed with psychophysical temporal tasks reflects aspects of neural efficiency associated with general intelligence. (c) 2006 Elsevier Inc. All rights reserved.