Millisecond Forums

Hi! I am programming a similarity judgment task using two pictures and a slider. All three appear at the same time at the beginning of a trial, but the two pictures must disappear after a fixed amount of time. The slider however must remain to give the opportunity to participants to respond even after the stimuli are gone. In the "how to's" it seems the only way to erase a stimulus during a trial is to present blanks over them. However I know that response latency is calculated starting from the drawing of the last stimulus. Since participants may respond either before or after the blanks, this is annoying (though not "impossible") to fix in the data in order to obtain latency starting from the presentation of the stimuli. Is there anyway to specify in Inquisit that latency is to be calculated from a fixed point in time or a particular stimulus presentation?