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Phoenix666 writes:

A study in an extended family of monkeys provides important insights into how the risk of developing anxiety and depression is passed from parents to children.The study shows how an over-active brain circuit involving three brain areas inherited from generation to generation may set the stage for developing anxiety and depressive disorders.

[...] "Over-activity of these three brain regions are inherited brain alterations that are directly linked to the later life risk to develop anxiety and depression,'' says senior author Dr. Ned Kalin, chair of psychiatry at the UW School of Medicine and Public Health. "This is a big step in understanding the neural underpinnings of inherited anxiety and begins to give us more selective targets for treatment."

[...] Interestingly, the brain circuit that was genetically correlated with individual differences in early-life anxiety involved three survival-related brain regions. These regions were located in the brain stem, the most primitive part of the brain; the amygdala, the limbic brain fear center; and the prefrontal cortex, which is responsible for higher-level reasoning and is fully developed only in humans and their primate cousins.

More evidence for epigenetics. If trauma can be encoded on the genetic level and passed down to offspring, can shared trauma affect a population's DNA and in turn express itself in its group behaviors/culture?