> So, in essence, what you're saying is that there does NOT have to be an ISI in
> between every stimuli presentation??? This is my main source of confusion. If
> there is no ISI, what comes in between two stimulus presentations? Can it be
> Stim A (2 sec), Stim B (2 sec), ISI (??? sec), Stim A, ISI, Stim B, Stim C, ISI,
> etc??? Thus, it would go directly from one event to another without an ISI?
It is possible but very unlikely. You run RSFgen to generate as many number of designs as you want, and find out the optimal design in terms of efficiency, an indicator of statistical power. If that one turns out to have some undesired ISI, I guess you can manually set up an extra layer of filtering criterion to exclude such senario.
Gang