SPMers,

I'm attempting to run a mixed model at the second level in SPM12 with 2 within-subject conditions, age as a continuous variable, and RT as a covariate. I'm particularly interested in probing the age-by-condition interaction, but I'm unsure as to how to set up the contrasts. Thus far, I've set up a full-factorial with Condition 1 and Condition 2 as within-subjects levels, and age and RT as covariates; you'll find a snapshot of the design matrix attached. So first, I'd like to know if my design matrix is set up appropriately, and secondly, which contrasts I should use to look at main effects, as well as the age-by-condition interaction.

Thanks,

Beth

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Elizabeth Heinrichs-Graham, Ph.D.

Assistant Professor, Department of Neurological Sciences

Center for Magnetoencephalography (MEG)

University of Nebraska Medical Center

988422 Nebraska Medical Center

Omaha, NE 68198-8422

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Phone: 402-552-6433

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