Figure 6.

Stimulus-locked LRP waveforms for HC (left panels) and ALS patients (right panels) as a function of current trial congruency (solid lines: congruent trials, dashed lines: incongruent trials). Black lines indicate that the previous trial was congruent; gray lines indicate that the previous trial was incongruent. Positive deflections reflect incorrect response activation; negative deflections reflect correct response activation. Response repetition trials (upper panels) exhibit a previous congruency by current congruency interaction that is absent in response alternation trials (lower panels). There were no differences between ALS patients and HC.