Greater Attention to Task-Relevant Threat Due to Orbitofrontal Lesion

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neurology

Background:

• Orbitofrontal cortex (OFC) injury, common after head trauma, often results in impaired emotional and social behavior regulation.
• Previous research suggests a link between OFC function and emotion-attention interactions.
• Understanding OFC's role in emotion-attention and cognitive control is crucial for explaining affective dysfunctions.

Purpose of the Study:

• To investigate attention allocation in patients with OFC lesions during cognitive tasks involving emotional stimuli.
• To examine how OFC lesions affect interactions between emotion, attention, and cognitive control.
• To elucidate the neural mechanisms underlying these interactions using electrophysiological measures.

Main Methods:

• A Go/NoGo visual discrimination task was administered to 13 patients with OFC lesions and 11 healthy controls.
• Task-relevant and task-irrelevant stimuli included threat-related (spider) and neutral (flower) figures.
• Behavioral performance and event-related potentials (ERPs) were recorded to assess attention and cognitive processing.

Main Results:

• Overall task performance did not significantly differ between groups.
• Patients with OFC lesions demonstrated improved performance with relevant threat signals compared to neutral signals, unlike controls.
• Task-relevant threat signals elicited larger frontocentral N2-P3 amplitudes in the OFC lesion group, indicating heightened resource allocation.

Conclusions:

• OFC injury leads to altered attentional and cognitive control resource allocation towards task-relevant emotional stimuli.
• The OFC plays a significant role in mediating emotion-attention and emotion-cognitive control interactions.
• Findings suggest the OFC contributes to balancing voluntary and involuntary attention networks, particularly with emotional stimuli, offering insights into affective dysfunction.