Several studies have suggested that negative memories fade faster than positive memories: Walker, Vogl and Thompson (1997) had the subjects kept dairy during a 3-month period, and rated the events on a pleasantness scale each time, memory tests were conducted on various intervals: 3 months, 1 year and 4.5 years. Results showed that pleasant events are remembered better compared to unpleasant ones, unpleasant ratings also decreased more than pleasant ratings compared to the original ratings. Ritchie et al.(2009) found that the fading affect for negative events is greater than its fixed affect. Kensinger (2008) found that older adults remembered positive nonarousing words better than negative nonarousing words;

There is Taylor's (1991) mobilization-minimization hypothesis trying to explain this phenomenon, are you aware of any studies addressing this phenomenon with neural data?

References

Kensinger, E. A. (2008). Age differences in memory for arousing and nonarousing emotional words. Journals of Gerontology: Series B: Psychological Sciences and Social Sciences, 63, P13–P18.

Ritchie, Timothy; Skowronski, John J.; Hartnett, Jessica; Wells, Brett; Walker, W. Richard (April 2009). "The fading affect bias in the context of emotion activation level, mood, and personal theories of emotion change" (PDF). Memory. 17 (4): 428–444. doi:10.1080/09658210902791665.

Taylor, S. E. (1991). Asymmetrical effects of positive and negative events: the mobilization-minimization hypothesis. Psychological bulletin, 110(1), 67.

Walker, W. R., Vogl, R. J., & Thompson, C. P. (1997). Autobiographical memory: Unpleasantness fades faster than pleasantness over time. Applied Cognitive Psychology, 11(5), 399-413.

  • Hi Sophy. why do you think bad memories decay faster than good memories? Do you have some scientific research that could back up that statement? Regarding question 2, there are some questions on this site about decay of memory. I will try to look them up for you. – Robin Kramer Sep 4 '16 at 9:20
  • The question cogsci.stackexchange.com/q/9595/11318 already explains a lot about memories and forgetting, but the answers is also interesting. Here is the maths behind forgetting: cogsci.stackexchange.com/q/5199/11318 . For other questions you can search for "memory decay" or "forgetting curve". – Robin Kramer Sep 4 '16 at 9:25
  • Yeah, I agree with Robin, ever heard of posttraumatic stress disorder? PSD is accompanied by persistent, explicitly bad memories. You should back this question up with research. -1, vote to close being unclear. Feel free to edit. Happy to remove vote after edits. PS, due to multiple questions it's too broad too. Sorry for nagging. – AliceD Sep 4 '16 at 10:19
  • 1
    Great edit, +1. Close vote retracted. – AliceD Sep 6 '16 at 19:29

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