PTSD occurs when intrusive memories linked to fear from a traumatic event become consolidated in a person's mind by them visualizing the event in a loop until it becomes locked in their brain. Competing with the visualization, such as with a game like Tetris, can block that consolidation form happening. "An intrusive memory is a visual memory of a traumatic event," said Emily Holmes, Professor of Psychology at the Karolinska Institute in Sweden, whose team led the study. "Tetris also requires imagination and vision. Your brain can't do two things at once, so this interrupts," she added.
Kotaku reports that the news was announced at this weekend's I <3 StarCraft event in South Korea, "a mini-tournament between some of the game's best players being held to honor the game's legacy."