You have to do some extra work to get that data. I would use the
ResponseDataCollection of the input mask of the stimulus object, e.g.,
t = StimSlide.InputMasks(1).Responses(13).RTTime -
StimSlide.InputMasks(1).Responses(1).RTTime
Take a look at the "Multiple Response Collection" example that you may
download from the PST website, and look at the appropriate topics in the
E-Basic Help facility.
-- David McFarlane