Abstract
Results from three visual inspection time (IT) tests and a new auditory IT test were correlated with psychometric measures of intelligence in an undergraduate population. The four IT tests correlated with each other at similar levels to the psychometric test intercorrelations. The range of raw IQ-IT correlations agreed with the predicted -0.35 that has been reported previously. Corrected correlations indicated that the true IQ-IT correlation is in the region of -0.55. This study corroborates the hypothesis that a substantial proportion of the IQ variance is located in individual differences in perceptual intake speed, both visual and auditory. The intercorrelation of the auditory and visual IT Tests indicates that IT is, in part, due to differences in nervous system functioning in general. The results do not support a specific strategy theory of IT performance.
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