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Hemodynamic concentration changes in low and high performers. Mean (± SEM) changes of [O2Hb] and [HHb] for the spatial 1-back minus 0-back contrast, 2-back minus 0-back contrast, and 2-back minus 1-back contrast. (A), (B) and (C) display the results for low performers. (D), (E) and (F) display the results for high performers.
