Ten participants with high schizotypal personality traits and 10 comparison participants completed a general knowledge task to measure monitoring resolution (i.e., the extent to which confidence judgments distinguished between correct and incorrect responses) and control sensitivity (i.e., the degree to which the control process was dependent on the monitoring process). The results showed that scores for monitoring resolution were significantly lower for participants with high schizotypal personality traits than for the comparison participants. There was no significant difference in scores for control sensitivity between the groups. The results suggest that a deficit in monitoring processes is a risk factor for the emergence of delusions.