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. 2014 Dec 4;4:7316. doi: 10.1038/srep07316

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Vernier duration for older and younger smokers and non-smokers in part two of the study (left). Error bars depict standard error of the mean (SE). There was only a significant difference between age-groups but no main effect of Smoking and no Age x Smoking interaction. SOAs for 5- (middle) and 25- element gratings (right) for older and younger smokers and non-smokers in part two of the study. Error bars depict standard errors of the mean (SE). There was only a significant difference between age-groups but no main effect of Smoking and no Age x Smoking interaction interaction.