Deal all,

I meet a problem when using make_random_timing.py to make up the stimuli timing files. In my delay recognition task, there is a long trial, including 2s sample stage, then (6s, 8s, or 10s) delay stage, and finally 3s probe stage. Within a trial (sample-interval-probe), the sample and probe duration is fixed, but interval has three types of duration (equally divided in each condition). The order and the onset of sample-interval-probe are fixed within a trial. There are two class of trials in a run, with a random order between them. The minimum ITI between two trials is 3s, and maximum is 9s. The timing should be locked with TR which is 2s.

I think it's easy to make timing file by modeling each trial. But it seems difficult to make it by modeling each event (sample, interval, or probe), especially with three types of interval duration and fixed onsets of sample, interval and probe. Could someone help me to figure it out? Thanks!

Qiuhai