I use computational modelling to understand how neurons produce cognitive processes like memory, attention and motivation by reward. I study how they are influenced by neurotransmitters such as dopamine and acetylcholine. My research group models eye movements, EEG, fMRI and single-neuron data to track these processes in health and disease. In particular, we ask how memory and motivation are affected by drugs, Parkinson's disease, and focal damage to the frontal lobe of the brain.