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Effects of age, cognitive flexibility (RPM) and working memory capacity (OSPAN) on the similarity across midline electrodes (top) and on the relative frontality of the P300 distribution (bottom). Error bars refer to the SE of the mean. LR, low-RPM group; HR, high RPM group; LO, low OSPAN group; HO, high OSPAN group; YA, Younger adults; OA, older adults.
