Story highlights ER patients who experienced a car accident were given psychological interventions to prevent PTSD

This included playing Tetris, which reduced intrusive memories in those using it by 62%

(CNN) After experiencing or witnessing a traumatic event, such as a car accident, people are likely to develop anxiety or distress in relation to that event soon after the experience, leading to post-traumatic stress disorder (PTSD).

But a new study has shown that playing the computer game Tetris within hours of experiencing trauma can prevent those feelings from taking over your mind.

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."

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