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Prefrontal target-related activation for group (F3,48=4.6, P<.01) and region (F1,48=12.8, P<.001), with greater activation in controls than early and chronic groups. There was medial frontal activation for group (F3,48=3.5, P=.02) with greater activation in the control than chronic group. Bars represent mean values; error bars, standard error. ACG indicates anterior cingulate gyrus; IFG, interior frontal gyrus; MFb, middle frontal gyrus.
