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. Author manuscript; available in PMC: 2017 Jan 1.
Published in final edited form as: Psychol Med. 2015 Sep 29;46(2):367–379. doi: 10.1017/S0033291715001889

Figure 1.

Figure 1

Left: Grand average ERP waveforms. Grand average ERP waveforms for response-locked error trials for age-matched Healthy Control (HC; blue), Hoarding Disorder (HD; green), comorbid Hoarding Disorder and Obsessive-Compulsive Disorder (HD+OCD; magenta) and Obsessive-Compulsive Disorder (OCD; red) participants. Waveforms are from FCz (indicated by red dot on topographic maps). The x-axis presents time in milliseconds from −100 ms (pre-response) to 750 ms (post-response) relative to the button press at 0 ms (vertical dotted line). The y-axis presents amplitude in microvolts (µV). Right: Scalp topography maps display ERN amplitudes averaged over a time window centered on the grand mean ERP peak latency (50–60 ms after the response event). Color bar indicates amplitude values in microvolts. Note the frontocentral distribution of the ERN, and the attenuated ERN for HD positive individuals relative to HC and OCD groups for the 25% (top panel) and the 75% (bottom panel) probability conditions in incongruent trials.