DR DAVID LEWIS is founder and Director of Research at the independent research consultancy Mindlab International. Dubbed the 'father of neuromarketing' for his pioneering studies analysing brain activity for research and commercial purposes, he currently specialises in non-invasive techniques for measuring human responses under real life conditions. He is the founding member of the Impulsivity Research Group (http-//www.impulsive.me.uk/), which is dedicated to researching the psychology, neurology and genetics of impulsive behaviour.