Preliminary examination of disgust learning as a potential OCD endophenotype

Area of Science:

• Psychology
• Psychiatry
• Behavioral Science

Background:

• Endophenotypes are intermediate phenotypes linked to genetic risk for disorders like OCD.
• The role of disgust conditioning abnormalities as an OCD endophenotype remains unclear.

Purpose of the Study:

• To investigate if disgust conditioning abnormalities characterize OCD in a way consistent with an endophenotype.
• To compare disgust conditioning in individuals with OCD, their first-degree relatives, and healthy controls.

Main Methods:

• A disgust conditioning task involving conditioned stimuli (CS+) and unconditioned stimuli (US) of disgusting videos.
• Acquisition and extinction phases to assess disgust responses.
• Comparison of disgust ratings between OCD patients, relatives, and controls.

Main Results:

• Participants with OCD reported significantly higher disgust ratings during acquisition compared to relatives and controls.
• No group differences were found in the conditioned response to CS+ versus CS-.
• Disgust proneness explained the heightened disgust response in the OCD group during acquisition.

Conclusions:

• Individuals with OCD exhibit a heightened readiness for disgust conditioning, potentially driven by increased disgust proneness.
• The study found no evidence to support disgust conditioning abnormalities as an endophenotype for OCD.