Damage to the ventromedial prefrontal cortex reduces interpersonal disgust

Area of Science:

• Neuroscience
• Social Psychology
• Cognitive Science

Background:

• Disgust responses to contaminants, immorality, and unsavory individuals are often considered related.
• The neural underpinnings of these different disgust categories remain unclear, with questions about overlapping versus specific brain substrates.

Purpose of the Study:

• To investigate whether different forms of disgust (core, moral, interpersonal) are mediated by distinct or shared neural mechanisms.
• To determine the specific role of the ventromedial prefrontal cortex (vmPFC) in processing different disgust types.

Main Methods:

• Studied 10 patients with ventromedial prefrontal cortex (vmPFC) damage.
• Compared avoidance behaviors in response to core, moral, and interpersonal disgust elicitors between patients and healthy/brain-damaged controls.

Main Results:

• Patients with vmPFC damage showed significantly less avoidance of interpersonal disgust scenarios compared to controls.
• These patients exhibited normal avoidance rates for core and moral disgust elicitors.
• This dissociation suggests a selective neural basis for interpersonal disgust.

Conclusions:

• Different forms of disgust are neurally dissociated.
• The ventromedial prefrontal cortex (vmPFC) plays a causal and selective role in mediating interpersonal disgust.
• vmPFC function is crucial for shaping social avoidance and approach behaviors related to interpersonal disgust.