In broad terms, my research is concerned with response control. I am interested in both exploring the neural basis of the control of movement and also in investigating psychological (or 'executive') functions, such as attention, expectation and planning which influence and modify processes of response selection. To these topics, I apply a range of neuroscientific techniques, including psychopharmacology, neurophysiology and analysis of both operant and unconditioned behaviour in humans (healthy volunteers and patient populations) and experimental animals. I am particularly interested in the frontal cortex and its basal ganglia circuits.