Suresh’s main research interests are in understanding how therapies alter brain activity and in developing methodologies to measure these changes in both healthy individuals and patient groups - particularly patients with depression. His previous studies have involved a range of compounds including hallucinogens (ketamine, LSD, psilocybin), anaesthetics (propofol, dexmedetomidine), anti-epileptics (vigabatrin, perampanel, tiagabine) and GABA-enhancers (zolpidem, gaboxadol). Suresh’s research has used a wide-range of neuroimaging techniques including magnetoencephalography, electroencephalography, functional magnetic resonance imaging and magnetic resonance spectroscopy.