Figure 1. Patients with psychotic disorders (top) and healthy individuals (bottom) with available ERP data on the flankers and picture/word tasks. SZ = schizophrenia or schizoaffective disorder, Other = affective psychosis, substance induced, NOS.

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Figure 2. Error-related negativity (ERN) across tasks, presented for the healthy group (top) and patients with psychotic disorders (bottom). Waveforms represent activity at electrode Cz and headmaps represent the error minus correct difference from 0-100ms, corresponding to how the ERN was scored.

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Figure 3. Error Positivity (Pe) across tasks, presented for the healthy group (top) and patients with psychotic disorders (bottom). Waveforms represent activity at electrode Pz, and headmaps represent the error minus correct difference from 200-400ms, corresponding to how the Pe was scored.

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Figure 4. Cronbach’s alpha of the error-related negativity for patients with psychotic disorders (top) and the healthy group (bottom), as a function of the number of trials. Error bars display representative 95% confidence intervals. Patients with available data ranged from 76 (2 trials) to 38 (20 trials) on the flankers task and from 84-25 on the picture/word task; the number of healthy individuals ranged from 52-33 on the flankers task and 41-21 on the picture/word task.

Figure 5. Cronbach’s alpha of the error positivity for patients with psychotic disorders (top) and the healthy group (bottom), as a function of the number of trials. Error bars display representative 95% confidence intervals. Patients with available data ranged from 76 (2 trials) to 38 (20 trials) on the flankers task and from 84-27 on the picture/word task; the number of healthy individuals ranged from 52-33 on the flankers task and 40-20 on the picture/word task.