Reaction time and response accuracy (number of correct hits) measures were available for 494 of the subjects. T-tests revealed that none of the diagnostic groups differed significantly from the control group on reaction time in response to targets (all t <1.79). Due to the non-normal distribution of the response accuracy data (overall hit rate out of 80: M=78.64 hits, SD=1.90, Median=79.00), Mann-Whitney U tests were used to test for differences between the control group and each diagnostic group. With one exception, response accuracy did not significantly differentiate the control group from any diagnostic group. The only exception was the ADHD group, which averaged one fewer hit (M=78.07, SD=1.97, Median=79.00) than the control group (M=79.09, SD=0.94, Median=79.00) (U=989.50, z=2.94, p<.01). Given the results of no significant effects between groups for reaction time and little effect for response accuracy, these variables were not considered further.
