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YSK if you've seen something traumatic, playing Tetris for a couple of hours afterwards can drastically reduce the chance of it becoming a deeprooted memory and causing PTSD
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When you see something traumatic, your brain will over the next few hours create images of the traumatic event. These images will come back to you as flashbacks over the years. Playing a game that requires high focus on visual details prevents the brain from creating those images, and as a result you'll get less (or not at all) flashbacks after the traumatic event.