Shell Shock is a somewhat specific condition, and not exactly the same as PTSD. PTSD is a psychological condition brought on by trauma. Shell shock is a neurological condition brought on by experiencing artillery fire, both the noise and the concussive impact. A person with shell shock had a physically damaged nervous system and damaged brain, which is why they would have uncontrollable body movement. However, when removed from the shelling and with treatment, they would show some improvement in motor skill.
WWI was a bit unique in the regard because in no other war were soldiers exposed to that much heavy artillery fire over a long period of time. Even in WWI, the cases of shell-shock were more pronounced during the mid-war period, where stationary trench warfare was the norm. There were fewer cases at the end of the war when the army became more mobile.
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