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In this video I briefly describe the symptoms of post-traumatic stress disorder, the people most often affected by it, and research on potential risk factors for the development of PTSD, including hippocampal volume.

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Gilbertson et al (2002) - Smaller hippocampal volume predicts pathologic vulnerability to psychological trauma: http://www.spl.harvard.edu/archive/spl-pre2007/pages/papers/martha/Hipp_Vulnerability.pdf

Bremner et al (1995) MRI-Based measurement of hippocampal volume in patients with combat-related post-traumatic stress disorder: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3233767/