Fig. 2.

ERPs and scalp topographies elicited for changes in consonant and dissonant sequences for non-musicians. Difference waves (black line) are the result of substracting the averaged response to standard stimuli (continuous line) from the averaged response to deviant stimuli (dashed line) in the Fz electrode. In the consonance condition two significant components were observed, an early positivity (P1) and a later negativity (MMN). For the dissonance condition no significant components were found. Scalp topographies reflect the activity for all the participants during the timing consistent with a MMN component.