Ten investigational ATCT performance metrics were calculated to
characterize baseline APS, best APS, and within-session APS improvements
accrued throughout the 1 h of training. APS improvement was calculated
as the percentage of change in stimulus duration that
participants were able to discriminate within a given level or group of
levels. As described below, APS and APS improvement were calculated
over varying time frames corresponding to the first level, stage, and
hour of ATCT