Inclusion Criteria:  Between 18-50 years of age English-speaking Capacity to provide informed consent Primary diagnosis of OCD with at least moderate severity  Exclusion Criteria:  Current or lifetime history of psychiatric disorders other than OCD that may increase the risk of participation History of any significant medical condition that may increase the risk of participation Alcohol or substance use disorder in the past year Exposure and response prevention for OCD within the last six weeks Currently taking psychotropic medication