Enhanced brain responsiveness during active emotional face processing in obsessive compulsive disorder.

Area of Science:

• Neuroscience
• Psychiatry
• Cognitive Psychology

Background:

• Abnormal emotional stimulus processing is characteristic of psychiatric disorders.
• Anxiety disorders often show overreaction to emotional cues linked to amygdala activation.
• Obsessive-compulsive disorder (OCD) responses are typically linked to disease-specific stimuli and frontostriatal systems.

Purpose of the Study:

• To investigate brain activation and functional connectivity during emotional face processing in OCD patients.
• To compare brain responses in OCD patients versus healthy controls using functional magnetic resonance imaging (fMRI).
• To explore the relationship between clinical symptom severity and neural alterations in OCD.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to scan 21 OCD patients and 21 healthy controls.
• Participants engaged in an emotional face-processing task requiring active response generation.
• Analysis focused on brain activation and functional connectivity in frontal cortex, amygdala, and fusiform face area.

Main Results:

• OCD patients displayed significantly increased activation in face-processing regions, including the amygdala, fusiform gyrus, and dorsolateral prefrontal cortex.
• Enhanced reciprocal functional connectivity was observed between face-processing regions in OCD patients.
• A significant correlation was found between OCD symptom severity and both task-related activation and network connectivity.

Conclusions:

• OCD patients exhibit heightened brain responsiveness during active emotional face processing.
• Enhanced amygdala-prefrontal connectivity in OCD differs from negative interactions seen in anxiety disorders, suggesting a disorder-specific pattern.
• These neural findings are significantly associated with the severity of obsessive-compulsive symptoms.