computer using a keyboard response pad. The number of trials presented in each of the two, four, and eight choice conditions was 96, 48, and 96, respectively. RT trials less than 150 ms or greater than 2000 ms were excluded from the calculation of the mean. See Luciano et al. (2001a) for a fuller description of this task. A general factor, explaining 51% of variance, was calculated from a principal components analysis of digit symbol, 4-choice RT and inspection time.
