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MID performance results for the CON and ADD group showing a) mean accuracy (**p < 0.01 Gain > Neutral); b) mean reaction time (**p < 0.01 Gain < Neutral); c) mean lose accuracy and d) mean lose reaction time. Data were analysed with permutation analyses of variance (5000 permutations), controlling for study site. Data are expressed as means and standard error means.
