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The P600 Repetition Effect. (A) Grand average ERPs to initial (dotted line) and repeated (solid line) presentations of congruous words, collapsed across repetition lag in normal controls (left) and participants with FXTAS (right). (B) Topographical maps of the LPC repetition effect (new-old congruous words). FXTAS group showed reduced P600 repetition effect compared to the normal controls (p = 0.006).
