Perhaps, but it is clearly more complicated than that. PTSD appears to be related to changes in the amygdala that make anxiety reactions more bursty and intens

Perhaps, but it is clearly more complicated than that. PTSD appears to be related to changes in the amygdala that make anxiety reactions more bursty and intense than they would otherwise be. What exactly triggers the reaction is not the problem as much as what happens next within the brain and thus the mind.