Prof Robertson says...

Mobile phones: "Using a mobile phone in a car - even a hands-free one - renders us essentially blind. When we are driving, 95 per cent of the time, we can do it automatically, but problems arise in the other 5 per cent when something unexpected requires our attention. Then, talking into a mobile phone is taking up a big chunk of our attention capacity. A lot of people have died on Irish roads because of this."

PlayStations: "PlayStation games kept in a proper balance sharpen visual attentional and perceptual skills. That's quite good for the brain but not at the expense of other activities in which children interact with other children."

Alcohol and young people: "Drivers under 21 shouldn't be allowed have any alcohol in their blood. An insufficiently developed brain and alcohol is a poisonous combination in terms of driving, suicide and the kind of violence in some young male behaviour."