The overarching goal of this protocol is to investigate mechanisms that influence symptom outcomes of exposure and response prevention (ERP) therapy for OCD. Mechanisms may include affective processes, learning factors, cognitive factors, or other constructs that could influence treatment outcomes. The study team will conduct this research within the context of an effective online treatment for OCD called OCD-NET. OCD-NET is bibliotherapy with coaching and its content is reflective of standard care for OCD.

Inclusion Criteria:

• English-speaking
• Located within the United States
• 18-90 years old
• Able to provide consent
• Current diagnosis of OCD as assessed by clinical interview

Exclusion Criteria:

• Adults unable to consent

• Individuals who are not yet adults (infants, children, teenagers)

• Participants currently located outside of the United States

• Prisoners

• Participants with hoarding as the primary OCD symptom

• Severe mental illness (e.g. schizophrenia, substance abuse); organic brain syndrome; or serious, current suicidal/homicidal ideation (based on phone screening or initial assessment)

• Concurrent enrollment in another psychotherapy treatment

• Participants taking psychotropic medication may be excluded if:

  • They have started a brand new psychotropic medication within the last 12 weeks
  • They have changed the dose of their psychotropic medication within the last 4 weeks
  • They anticipate that they cannot maintain the current dose of their psychotropic medication for the duration of the study

• Participants may be excluded if they have any cognitive or physical impairments that would interfere with their participation (e.g., significant head injury, cognitive disability, dementia).