Gilbertson et al. (2002)found that Vietnam veterans who had developed PTSD and which other group both had reduced hippocampal volumes relative to controls, suggesting that the small hippocampus made the PTSD patients more vulnerable to the disorder?

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Gilbertson et al. (2002) found that both Vietnam veterans with PTSD and their unexposed twins had reduced hippocampal volumes compared to controls. This suggests a pre-existing vulnerability to PTSD, rather than the small hippocampus being a result of the disorder.

Gilbertson Et Al