The document summarizes a study on the anchoring effect from a metacognitive perspective. The study found that: 1) People's judgments were influenced by externally provided anchors (EPAs), and the influence was greater when the EPA was similar to people's self-generated anchors and the source was deemed credible. 2) People adjusted their judgments less when the EPA was high and similarity/credibility was also high, but adjusted more when the EPA was low. 3) Confidence in judgments was higher when similarity and source credibility were high, and people interacted as predicted by the metacognitive model of anchoring.