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The one thing I have often heard regarding changes in the brain due to trauma and PTSD is that the amygdala is enlarged (e.g. Kuo et al, 2012). This is understandable considering the amygdala is responsible for the fear response.

However, looking more into changes in the brain, there are contradicting reports of smaller amygdala (e.g. Rogers, et al. 2009). What is the current concensus on this?

References

Kuo, J. R., Kaloupek, D. G., & Woodward, S. H. (2012). Amygdala volume in combat-exposed veterans with and without posttraumatic stress disorder: a cross-sectional study. Archives of general psychiatry, 69(10), 1080-1086. https://doi.org/10.1001/archgenpsychiatry.2012.73

Rogers, M. A., Yamasue, H., Abe, O., Yamada, H., Ohtani, T., Iwanami, A., ... & Kasai, K. (2009). Smaller amygdala volume and reduced anterior cingulate gray matter density associated with history of post-traumatic stress disorder. Psychiatry Research: Neuroimaging, 174(3), 210-216. https://doi.org/10.1016/j.pscychresns.2009.06.001

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