Memory conformity for high-confidence recognition of faces.

Memory judgments made by an individual may be affected by the memory judgments made by another individual, a phenomenon named memory conformity. It is unclear, however, whether memory conformity affects the well demonstrated positive relationship between accuracy and confidence, and more importantly, whether it affects the accuracy of high-confidence memory judgments. Here, we investigated these possibilities in three experiments wherein participants performed recognition followed by confidence judgments of studied and novel faces, after being exposed to the recognition responses of a fictional participant whose responses could be valid or invalid (74% and 26% of the responses, respectively). In all three experiments, accuracy for high confidence "old" and "new" responses was affected by the responses of the fictitious participant, with invalid responses producing consistent decreases in high confidence accuracy. In addition, confidence-accuracy characteristics (CAC) analysis revealed that invalid responses were particularly impactful on the assignment of confidence for faces judged as "new," a pattern that sheds light on prior findings regarding the effects of cueing on mean confidence. Thus, further than demonstrating that the exposition to the memory judgments of another person affects high confidence recognition, we show that such exposition produces distinct effects on the assignment of confidence for "new" versus "old" memory judgments.