CBM-TAF will employ an ambiguous sentence-completion task, where participants have to fill in a missing letter in a fragmented word and resolve emotional ambiguity of a given scenario. At the beginning of each training session, participants will watch a brief animated video about TAF, OCD, and modifying TAF. Each training session will consist of 40 scenarios, which will take about 20 minutes to complete. There will be a total of 6 sessions (2x/week for 3 weeks).

Similar to CBM-TAF, CBM-SMP will employ an ambiguous sentence-completion task, where participants have to fill in a missing letter in a fragmented word. However, the content of scenarios in CBM-SMP will focus on general stress management techniques. At the beginning of each training session, participants will watch a brief animated video about OCD and stress management techniques. Each training session will consist of 40 scenarios, which will take about 20 minutes to complete. There will be a total of 6 sessions (2x/week for 3 weeks).

Participants in WL group will only complete weekly assessment measures without engaging in any training sessions.

CBM-TAF aims to modify TAF by training participants to adopt an interpretation style that is inconsistent with TAF (i.e., having unwanted thoughts is not morally equivalent to acting upon them and/or having unwanted thoughts does not increase the likelihood of feared events happening in real life). To personalize the training, CBM-TAF is designed to address 4 subtypes of OCD (as defined by Dimensional Obsessive-Compulsive Scale; Abramowitz et al., 2010), each of which targets either TAF-moral or TAF-likelihood. Participants will indicate two OCD subtypes that are most relevant to their experiences and only complete scenarios that correspond to their chosen subtypes. For each scenario, participants are instructed to enter a missing letter in a fragmented word and resolve its emotional ambiguity. After then, participants will answer a True/False question related to the given scenario to verify their comprehension and consolidate their acquisition of healthier interpretation style.

The Thought-Action-Fusion Scale (TAFS; Shafran et al., 1996) is a 19-item measure, which assesses the presence and severity of TAF among adults. The measure uses a 5-point Likert scale, which ranges from 0 (Disagree Strongly) to 4 (Agree Strongly) with 12 items assessing TAF-moral, 3 items assessing TAF-likelihood-self, and 4 items assessing TAF-likelihood-others. The measure generates three scores (TAF-total, TAF-Moral, TAF-likelihood) and higher scores indicate higher severity.

Dimensional Obsessive-Compulsive Scale (DOCS; Abramowitz et al., 2010) is a 20-item self-report measure, which assesses the severity of four dimensions of obsessive-compulsive symptoms among adults: 1) Concerns about Germs and Contamination, 2) Concerns about being Responsible for Harm, Injury, or Bad Luck, 3) Unacceptable thoughts (e.g., sex, immorality, violence), and 4) Concerns about Symmetry, Completeness, and the Need for Things to be "Just Right". The measure uses a 4-point Likert Scale, and the total score of DOCS ranges from 0 to 80. A cutoff score of 21 was established to distinguish individuals with clinically severe OC symptoms by the measure developers (Abramowitz et al., 2010).

Depression, Anxiety, and Stress Scale (DASS-21; Lovibond & Lovibond, 1995) is a 21-item self-report measure, which assesses symptoms of depression, anxiety, and stress. The measure uses a 4-point Likert scale, which ranges from 0 (Did not apply to me at all) to 3 (Applied to me very much or most of the time). Higher scores indicate more severe depression, anxiety, and stress symptoms.