There are many studies that have studied amygdala response differences between PTSD subjects and controls:
Armony, Jorge L., et al. "Amygdala response in patients with acute PTSD to masked and unmasked emotional facial expressions." American Journal of Psychiatry 162.10 (2005): 1961-1963. LINK
Shin, Lisa M., Scott L. Rauch, and Roger K. Pitman. "Amygdala, medial prefrontal cortex, and hippocampal function in PTSD." Annals of the New York Academy of Sciences 1071.1 (2006): 67-79. LINK
Debiec, Jacek, and Joseph E. LeDoux. "Noradrenergic signaling in the amygdala contributes to the reconsolidation of fear memory: treatment implications for PTSD." Annals of the New York Academy of Sciences 1071 (2006): 521-524. LINK

The amygdala is implicated in emotional valence for many circuits and there is a clear emotional response implication with PTSD. The very defining of an event as traumatic is to consider the emotional and overall psychological implications of said event.

Thanks so much for the support and for joining the discussion!