A new brain scan study shows witnessing someone else get bullied can trigger an instant distress response, especially in people who have been bullied before — and that the physical reaction can contribute to a mob mentality.

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“When we see violent imagery, aggression and angry images, it stirs up a certain type of response,” said Dr. Asha Patton-Smith , a psychiatrist at Kaiser Permanente in Falls Church, Virginia. “And if you’ve had previous experience with aggression or bullying, it may increase that response.”

The study, “Exposure

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