Preserved electrophysiological markers of confidence in schizophrenia spectrum disorder.

Yet, it has been shown in healthy participants that task difficulty decreases the amplitude of the ERN 20 , so we reasoned that comparable group performance, which may include differences in performance between groups that did not reach statistical significance, might still underlie subtle discrepancies between individuals that are not captured behaviorally, but that might nevertheless contaminate measures such as ERPs.

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