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The N400 congruity effect. (A) Grand average ERPs to initial presentation of congruous (dark line) and incongruous (grey line) words in normal controls (left) and participants with FXTAS (right). The N400 congruity effect is shaded where present in channels T6 and Wr. The N150 is labelled ‘N1’ in the left occipital (O1) channel. (B) Topographical maps of the congruity effect (incongruous–congruous words). FXTAS high and low memory subgroups shown on right.
