Thesis: Traumatic Events Are Generally Memorable

Susan A. Clancey, The Trauma Myth (2009) (footnote omitted):

...[M]ost research shows that the more traumatic an event is, the more likely it is to be remembered. Further, there is no clear neurobiological evidence that repression (the mind immediately and automatically erasing a memory) is even possible.

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The dynamic evidence page

It's here: the law of evidence on Spindle Law. See also this post and this post.