Fig. 3.

Stimulus-locked ERP waveforms depicting the N200 component (averaged across FCz and Cz electrodes). Top panels: compatible and incompatible trials superimposed in each graph for each of the four musical practice levels (no, low, intermediate, and high). Bottom panels: Stimulus-locked difference waves (incompatible minus compatible trials) with the four musical practice levels superimposed (bottom left), and the corresponding topographic voltage map for the N200 component, using the difference waveforms averaged across musical practice level (bottom right).