From news.bbc.co.uk:

Volunteers were exposed to distressing images, with some given the game to play 30 minutes later, the PLoS One journal reported.

Players had fewer "flashbacks", perhaps because it helped disrupt the laying down of memories, said the scientists.

It is hoped the study could aid the development of new strategies for minimising the impact of trauma.

However, the researchers accept translating their findings into practical applications could prove difficult.

Source