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Some bacterial/viral diseases have been known to affect the formation of new memories (see the famous case study of Clive Wearing). Perhaps a character is yet unaware of their diagnosis, and thi...
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Source: https://writers.stackexchange.com/a/12536 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Some bacterial/viral diseases have been known to affect the formation of new memories (see the famous case study of Clive Wearing). Perhaps a character is yet unaware of their diagnosis, and things in their life start "slipping through the cracks". Lack of attention promptly after an event can also interfere with the formation of memory. Perhaps something startling happens to the character exactly after or even during the fatal event. This is a little far-fetched unless the killing itself is somewhat accidental or even incidental, as such a powerful emotion (associated with committing a major crime) would dominate one's attention. But for example, someone could "bump" something on the road, be concerned about it, but before checking up on the matter receive a phone call from one's mum. Two weeks later the character hears about a hit and run and finally realizes it was that fateful bump. Quite a moral dilemma here whether or not to turn oneself in. Perhaps the character calls back her mum to see if she remembers anything notable from the time of that call--looking for clues/salvation/deniability. What a taught conversation that would be. hth.