Hi,
My regressor of interest is a working memory period. If I added one parametric modulator (trial-by-trial attention level) and used contrast 1 for this modulator, the regions I identified are those whose activity is parametrically modulated by attention during working memory. If I added two parametric modulators for this regressor, attention level and difficulty score that subject reported in each trial, and used contrast 1 0, can I say I am identifying attention-modulated regions regressing out the potential confounding effect of task difficulty?
Thanks
Mike
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