On this account, it becomes possible to see why trauma might later lead to hallucinatory experiences. In Chapter 14 we saw that source-monitoring failures tend to occur when we experience intrusive or automatic thoughts. (This is because the effort taken to generate a thought acts as a cue telling us that the thought is self-generated.) It follows that a person who has poor source-monitoring skills will be most vulnerable to hallucinations when experiencing a flood of intrusive thoughts and images. Trauma (we know from the research literature on post-traumatic stress disorder) often has
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