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Nadine,

It is recommended that you model the two event separately. You'll have a correct condition and an incorrect condition.

The general idea of modelling is to model as much of the variance as possible in the signal, since you know that you have two types of conditions, you should model both.

Best Regards, Donald McLaren
=================
D.G. McLaren, Ph.D.
Postdoctoral Research Fellow, GRECC, Bedford VA
Research Fellow, Department of Neurology, Massachusetts General Hospital and
Harvard Medical School
Office: (773) 406-2464
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On Wed, Jun 15, 2011 at 2:15 PM, Gaab, Nadine <[log in to unmask]> wrote:

Hi list! We have a quick question. We are analyzing an event-related design in SPM8 and have correct and incorrect responses. We don’t care about the incorrect responses and would like to model only the correct responses. Do people recommend doing this via a regressor (with 0 for incorrect and 1 for correct responses) or by modeling the incorrect and correct responses as separate conditions (but ignore the incorrect responses in the contrasts)?

 Thanks

Nadine

 

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"If we knew what it was we were doing, it would not be called research, would it?" A. Einstein (1879-1955)

 

Nadine Gaab, PhD

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