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Effect of COMT genotype on accuracy during the VAC task. A statistically significant effect of COMT genotype was found on accuracy (percentage correct) only at the highest level of attentional control. A met allele load effect was found with individuals homozygous for the met allele performing significantly better than the val/met (vm) heterozygotes and the val/val (vv) homozygotes. mm, met/met. Error bars represent SEM.
