Trial reportBMC psychiatry2026
Disgust-reduction evaluative conditioning (DREC) and tDCS in contamination-based OCD: a randomized controlled trial.
Trial report in BMC psychiatry, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT05907369 (Disgust Reduction Through Evaluative Conditioning and tDCS in Patients With Contamination-Based OCD), which is not on this map. Not yet cited in PubMed.
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The trial behind it
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Disgust Reduction Through Evaluative Conditioning and tDCS in Patients With Contamination-Based OCD
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0 citing papers in PubMed.
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Authors and funding
5 authors.
Funding
Abstract
backgroundPeople with contamination-based obsessive‒compulsive disorder (C-OCD) experience contamination-related stimuli as more disgusting than normal, which leads to avoidance behavior or washing and cleaning compulsions. This study aimed to investigate whether evaluative conditioning through repetitive pairing of a contamination-related stimulus with a pleasant stimulus and transcranial stimulation over the orbitofrontal cortex (OFC), the brain area involved in disgust processing, can reduce the intensity of disgust experienced.
methodForty-eight participants (85% women) with C-OCD were included in a four-armed randomized control trial. They received either sham or active transcranial direct current stimulation (tDCS) over the OFC combined with either a sham or active disgust-reduction evaluative conditioning (DREC) program for 10 sessions (five days a week). EEG recordings, self-reported measures, and cognitive tests were performed before, after, and after 2-month follow-up.
resultsParticipants receiving active conditioning showed significant reductions in disgust intensity and obsessive–compulsive symptoms (p ≤ 0.01). Active stimulation was also followed by symptom improvement over time, although no significant additive benefit beyond conditioning alone was observed. Exploratory EEG analyses indicated alterations primarily in theta, alpha, and high-beta activity. Inhibitory control improved in groups receiving active conditioning (p ≤ 0.05), whereas attentional bias remained unchanged.
conclusionsThe present findings suggest that DREC may reduce disgust intensity and obsessive–compulsive symptoms in contamination-based OCD. OFC-targeted tDCS was well tolerated but showed no significant additive benefit beyond conditioning alone, warranting further study in larger samples. These findings support the potential of disgust-focused interventions in C-OCD.
trial registrationNCT05907369 at ClinicalTrials.gov. Retrospectively registered on 15 May 2023.
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