are any). High scores in Omissions, Commissions, and Overall Hit Reaction Time pertain to
inattentiveness. High scores on Overall Standard Error and Variability relate to response consistency
and “erraticness.” A high T-score for d' is commonly associated with poor perceptual power for this task
and a below average ability to discriminate targets from non-targets. High scores on either Hit RT ISI
Change or Hit SE ISI Change tend to indicate a difficulty to adjust to changing task demands. High
commission T-scores can be the result of inattentiveness, but when coupled with average or faster than
average reaction times (e.g., Overall Hit RT T-score of 50 or less), it also can be due to impulsivity. High
scores on either Hit RT Block Change or Hit SE Block Change result from a decline in performance as
the test progressed, and high scores on these measures may relate to vigilance deficits.