Previous studies have shown that many people hold personal memories for events that they no longer believe occurred. This study examines the reasons that people provide for choosing to reduce autobiographical belief in vividly recollected autobiographical memories. A body of nonbelieved memories provided by 374 individuals was reviewed to develop a qualitatively derived categorization system. The final scheme consisted of 8 major categories (in descending order of mention): social feedback, event plausibility, alternative attributions, general memory beliefs, internal event features, consistency with external evidence, views of self/others, and personal motivation; and numerous sub-categories. Independent raters coded the reports and judged...