Feedback-Related P300 components.

<p>(a) ERP waveforms from a cluster of parietal electrodes time-locked to the offer price (stage #9) separated according to price valence (overpriced vs. underpriced) and price prediction error (large vs. small). The y axis shows amplitude in microvolts (μV) and x axis shows time in milliseconds. The dashed line indicates the time window used to quantify the P300. (b) Scalp maps showing P300 contrasts between underpriced large and underpriced small trials (UL–US; left) and between overpriced large and overpriced small trials (OL–OS; right), alongside a description of the location of the electrode cluster used in this analysis. Colour bar represents maxima and minima (μV). (c) Bar chart plotting P300 amplitudes (μV) as a function of price valence and price prediction error. * <i>p</i> < .05.