What was one effect of world war i on the field of psychology?

It led to recognition of post-traumatic stress as a legitimate psychological ailment
By exposing the citizen armies of Europe to prolonged and extreme danger, World War One generated psychological casualties on an industrial scale. This, in turn, created a military crisis that drew doctors from a diverse range of specialties into the field of mental health; never before had so much attention been focused on a single psychiatric disorder.

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