Recollections of unexpected and emotional events (called "flashbulb" memories) have long been the subject of theoretical speculation. The fourth Emory Symposium on Cognition brought together everyone who has done research on memories of the Challenger explosion, in order to gain better understanding of the phenomenon of flashbulb memories: How do flashbulb memories compare with other kinds of recollections? Are they unusually accurate, or especially long-lived? Do they reflect the activity of a special mechanism, as has been suggested? The book also addresses more general issues of affect and accuracy: Do emotion and arousal strengthen memory? If so, under what conditions? By what physiological mechanisms?