A Simple Cognitive Task to Reduce the Build-Up of Flashbacks After a Road Traffic Accident

This research study is designed to investigate the effects of a simple cognitive task (a memory reactivation cue following by playing the computer game "Tetris") on flashbacks and other post-traumatic stress symptoms after a road traffic accident. Patients presenting to a hospital emergency department soon after a road traffic accident will be randomly allocated to either the simple cognitive task intervention or usual care. Participants will be followed up at one week and one month. It is predicted that participants given the simple cognitive task intervention will develop fewer flashbacks and less severe clinical symptoms than those who are not. This will inform the potential future development of a simple technique to prevent distressing psychological symptoms after a traumatic event.