Bias (metacognition)

According to this research paper: Neural correlates of metacognitive ability and of feeling confident: a large-scale fMRI study, there exists a negative correlation between feelings of confidence on one’s task-performance and metacognitive abilities. That is, the more confident one feels about one’s task-performance, the less developed a person’s metacognitive abilities are.

Here’s a video explaining how being underconfident can be  beneficial :