Dr. Johnston became interested in the field of Visual Neuroscience while studying Psychology at Queen’s University Belfast. He went on to complete a PhD at the University of Nottingham where he investigated the role of motion and form vision in neurodevelopment disorders. It was during this time that Dr. Johnston developed an interest in neurophysiology. This took him to America where he embarked upon a postdoc studying how brain-wide arousal signals modulate spiking responses, behavior and non-invasive biomarkers including electroencephalography (EEG), eye tracking and pupillometry. In his current role, Dr. Johnston investigates the diagnostic and prognostic utility of fixational eye movements (FEMS) in patients with concussion. These small, jerk-like movements called "microsaccades" are known to be larger in amplitude following a concussion, suggesting that they could be used for concussion detection and aid in clinical decision-making regarding return-to-play.