“In a study involving the offspring of stressed male mice conducted at Emory University School of Medicine in 2013, researchers discovered that traumatic memories could be passed down to subsequent generations through epigenetic changes that occur in DNA. Mice in one generation were trained to fear a cherry blossom–like scent called acetophenone. Each time they were exposed to the smell, they simultaneously received an electric shock. After a while, the shocked mice had a greater amount of smell receptors associated with that particular scent, enabling them to detect it at lower concentrations. They also had enlarged brain areas devoted to those receptors. Researchers were also able to identify changes in the mice’s sperm. The most intriguing aspect of the study is what occurred in the next two generations. Both the pups and grandpups, when exposed to the blossom odor, became jumpy and avoided it, despite never having experienced it before. They also exhibited the same brain changes. The mice appeared to inherit not only the sensitivity to the scent, but also the fear response associated with it.64”
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Mark Wolynn,
It Didn't Start with You: How Inherited Family Trauma Shapes Who We Are and How to End the Cycle