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We replicated previous findings that perifilm <jats:styled-content style=\"fixed-case\">HR<\/jats:styled-content> decreases predicted the development of intrusive images and further showed this effect to be specific to images rather than thoughts, and to detail rather than gist recognition memory. Moreover, a group of individuals showing both an atypical sudden reduction in <jats:styled-content style=\"fixed-case\">HR<\/jats:styled-content> after a startle stimulus and higher trait dissociation was identified. Only among these individuals was lower perifilm <jats:styled-content style=\"fixed-case\">HR<\/jats:styled-content> found to indicate higher state dissociation, fear, and anxiety, along with reduced vividness of intrusions. The current findings emphasize how peritraumatic physiological responses relate to emotional reactions and intrusive memory. 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