If you have the cues as one event and rewards as the second event type, then you can add a parametric modulator for each event type separately.

Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
Postdoctoral Research Fellow, GRECC, Bedford VA
Website: http://www.martinos.org/~mclaren
Office: (773) 406-2464
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On Thu, Oct 24, 2013 at 5:41 AM, Claire (Jung Eun) Han <[log in to unmask]> wrote:
Dear experts,

I was wondering if I could ask you a question. 
I would like to model both value signal and prediction errors (regressors) in my model but I would like to do so at different time points (e.g., value signal at onsets of cues + prediction error at onsets of rewards).

Is this possible? How do I proceed?

Thanks so much!,
Claire