Long-term memory for the terrorist attack of September 11: flashbulb memories, event memories, and the factors that influence their retention.

@article{Hirst2009LongtermMF,
  title={Long-term memory for the terrorist attack of September 11: flashbulb memories, event memories, and the factors that influence their retention.},
  author={William Hirst and Elizabeth A. Phelps and Randy L. Buckner and Andrew E. Budson and Alexandru Cuc and John D. E. Gabrieli and Marcia K. Johnson and Cindy Lustig and Keith B. Lyle and Mara Mather and Robert Meksin and Karen J. Mitchell and Kevin N. Ochsner and Daniel L. Schacter and Jon S. Simons and Chandan J. Vaidya},
  journal={Journal of experimental psychology. General},
  year={2009},
  volume={138 2},
  pages={
          161-76
        }
}
More than 3,000 individuals from 7 U.S. cities reported on their memories of learning of the terrorist attacks of September 11, as well as details about the attack, 1 week, 11 months, and/or 35 months after the assault. Some studies of flashbulb memories examining long-term retention show slowing in the rate of forgetting after a year, whereas others demonstrate accelerated forgetting. This article indicates that (a) the rate of forgetting for flashbulb memories and event memory (memory for… 

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References

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TLDR
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SUMMARY This research compares event memory and autobiographical memory for an event that was experienced to be more distressing, with more significant and widespread consequences than was any other
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