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Subtraction waveforms at Pz (condition OOX minus condition XXX, where X is the stimulus being averaged as a function of the preceding sequence). The younger adult group is shown on the left and the older adult group on the right; top: subjects are sorted into high- and low OSPAN groups; bottom: subjects are sorted into high- and low-RPM groups. Note the larger P300 to stimulus change for both low OSPAN groups, and the smaller (and in fact inverted) effect for the RPM groups.
