Figure 4.

Grand-averaged ERPs for stable and reversal trials and difference waves (reversal minus stable) at electrodes representative of the observed amplitude differences. ERPs were time-locked to tone 1, but note that the time scale is adjusted such that tone-2-onset was treated as time zero for analysis purposes (because tone 2 was the ambiguous tone). The time windows of the main components of interest are denoted by the dotted gray lines (see main text for details): aRN = auditory reversal negativity; aLPC = auditory late positive complex; PRP = pre-reversal positivity.