What was the Theory that Psychologists used to explain symptoms of PTSD?

Like, what did they think happened to people who developed stutters after traumatic incidents, or lost pockets of time and were in fugue states? The devil? Chemical Warfare? I'm super curious and none of the websites I've looked at have told me anything but the history *after* it was established. This was... show more Like, what did they think happened to people who developed stutters after traumatic incidents, or lost pockets of time and were in fugue states? The devil? Chemical Warfare? I'm super curious and none of the websites I've looked at have told me anything but the history *after* it was established. This was just in 1980, so it's not telling me about the 50s, or the 20s, or the 1800s, etc...
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