Hello!

I am analyzing a relatively simple event-related design with 5 second trials throughout the run, each of which begin with a stimulus that has a duration of 3 seconds. The trials can be relatively close in time, and I'm trying to tease out effects in a few stimulus categories (presented randomly). I am giving AFNI my stim times in real time (seconds) -- not necessarily associated with TRs. However, I assume that it isn't ideal to model these 3 second events as "pulse" events, but rather make sure that the HRF "knows" the events are 3 seconds long. Is this necessary to include in the proc py script, and if so, where can we inform the model that the stimuli have durations of 3 seconds?

Thank you kindly!

cephalopod