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One hundred forty-five Danes between 72 and 89 years of age were asked for their memories of their reception of the news of the Danish occupation (April 1940) and liberation (May 1945) and for their most negative and most positive personal memories from World War II. Almost all reported memories for the invasion and liberation. Their answers to factual questions (e.g., the weather) were corroborated against objective records and compared with answers from a younger control group. The older participants were far more accurate than what could be predicted on the basis of results from test-retest studies using short delays. The "permastore" metaphor (Bahrick, 1984) provides a possible interpretation of this discrepancy. Participants with reported ties to the resistance movement had more vivid, detailed, and accurate memories than did participants without such ties. Ratings of surprise and consequentiality were unrelated to the accuracy and clarity of the memories.
Berntsen et al. (Sun,) studied this question.