Mental illness is an epidemic that affects millions of people in the United States every year. Pioneering research in neuroscience and pharmaceuticals will help mitigate the epidemic, but the necessary research cannot begin without psychology. For example, OCD is characterized by compulsive behavior often in the form of excessive cleaning or grooming. Recently, neuroscientists have managed to block compulsive behavior by manipulating part of the orbitofrontal cortex. These neuroscientists would not have known how to associate OCD with the orbitofrontal cortex without clinical psychology research indicating that most compulsive behavior was triggered by a conditioned visual stimulus specific to each person with the disorder (Holmes, Craske, and Graybiel 2014). . Psychology not only points neuroscientific research in the right direction, but also allows discoveries in the brain to have real application for people in