ttentional Control and Brain Metabolite Levels in ethamphetamine Abusers

esults: The methamphetamine abusers exhibited reduced attentional control (i.e., increased Stroop interference) compared with the ontrols (p .04). Bonferroni-adjusted comparisons revealed that ACC levels of N-acetyl aspartate (NAA)– creatine and phosphocreatine (Cr) ere lower and that levels of choline (Cho)–NAA were higher in the methamphetamine abusers compared with the controls, at the adjusted value of .0125. Levels of NAA-Cr, but not of Cho-NAA, within the ACC correlated with measures of attentional control in the methamphetmine abusers (r .41; p .01) but not in controls (r .22; p .42). No significant correlations were observed in the PVC (methamphetmine abusers, r .19; p .28, controls, r .38; p .15).