Thank you for your response. So just to be clear. If the event-related design has two stimuli types, I can add two EVs and set two contrasts ([1 0] and [0 1]) to get activation due to each EV (each stimulus type in the event-related design). Is this what you mean? I appreciate your help.
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Yes, just add to the design an EV with those events. I assume the random rest events were random for the subject, but ideally you'd know when they happened.
All the best,