London - Playing the computer game Tetris within six hours of a traumatic event is being tested as a treatment for reducing or preventing post-traumatic stress disorders and flashbacks.

Tetris involves recognising shapes and directing moving coloured blocks into rows as they land.

In a trial at John Radcliffe Hospital in Oxford, people involved in accidents will be offered the chance to play the game — the theory is that the activity will compete for space with images of trauma in the part of the brain that processes what we perceive with our senses, including sight.

As a result, patients will be less likely to retain visual memories of the trauma, reducing flashbacks. - Daily Mail