Choose a proper /repsonseinterrupt for your <trial> and make diligent use of stimulus elements' /erase attribute.
In this trial, a fixation cross is displayed for 1s and then a target stimulus is displayed. Participants respond to the target with a key press. I can't find a way to make the target stimulus stay visible on the screen for the remaining duration of the trial after participants respond. Any help would be appreciated.
<trial SART.nontarget>/trialduration = 2500/posttrialpause = 100/stimulustimes = [1=fixation;1000=nontarget]/correctresponse = (57)/validresponse = (57, noresponse)</trial>