'One of the games causing many problems is the warfare series Call Of Duty. It is highly addictive and people play for hours on end. They spend all day killing people, then come off it and have to go about their daily business. I believe such games are one reason we are getting more violent.'

'I've got several patients who are what would be clinically termed addicted to... computer games. These things set the brain up for a pattern of gross fluctuation, too many highs and lows. For a short time, they can make people feel valued and boost their self-esteem. When they realise these feelings don't last, some people - particularly youngsters - can become down, even having feelings of depression.'