Watching wall-to-wall coverage of domestic terrorism can cause people to develop symptoms of post-traumatic stress disorder. Those symptoms, in turn, can cause people to seek out more upsetting coverage in the future, creating a cycle that can be hard to break.

For a study published today in the journal Science Advances, UC Irvine psychologist Rebecca Thompson and her team spent three years collecting survey data from over 4,000 US residents. The team surveyed these residents four times, asking about media consumption and mental health. The cycle began with the Boston Marathon bombings in 2013. (Previous research showed that people exposed to six hours of daily coverage of the Boston Marathon bombing in the week following the attack had…

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