The relationship between three auditory inspection time tasks and general intelligence

Three inspection-time tasks measuring the amount of time required to discriminate differences in pitch, loudness and phase were administered alongside the Multidimensional Ability Battery and Raven s Advanced Progressive Matrices to 75 undergraduate students. The auditory tasks were administered adaptively, and thresholds were estimated by fitting a logistic function to each set of data. After correcting for restriction of range the three thresholds intercorrelated significantly, and correlated between 0.33 and 0.68 with scores on the ability tests. A composite auditory inspection time score correlated between 0.35 and 0.42 with the ability measures ( 0.50 to 0.54 after correction). Although strategy-use enhanced performance on the pitch inspection-time task, strategy use was unrelated to intelligence and did not mediate the correlation between inspection time and intelligence. 2005 Elsevier Ltd. All rights reserved.