Dr. Vance is a clinical psychologist researching non-biological interventions for obsessive-compulsive disorder (OCD). She wants to evaluate the efficacy of Exposure and Response Prevention (ERP) — a cognitive-behavioural alternative to the medical model of drug therapy — in reducing compulsive hand-washing behaviours.
Explain how Dr. Vance could investigate the effectiveness of Exposure and Response Prevention (ERP) as a treatment for obsessive-compulsive disorder (OCD).