Cardiac-Sympathetic Contractility and Neural Alpha-Band Power: Cross-Modal Collaboration during Approach-Avoidance...

Area of Science:

• Neuroscience
• Cognitive Psychology
• Psychophysiology

Background:

• Growing evidence suggests the cardiac-sympathetic nervous system responds to cognitive challenges.
• The precise role of these responses in cognitive function remains debated, with questions about whether they are merely epiphenomenal or actively involved.

Purpose of the Study:

• To investigate the intertwined role of the cardiac-sympathetic nervous system and cognitive function during approach-avoidance conflict.
• To determine if cardiac-sympathetic responses are passive byproducts or integral components of cognitive processing.

Main Methods:

• Healthy human participants engaged in an approach-avoidance task, balancing monetary reward against electric shock.
• Simultaneous electroencephalography (EEG) and cardiac-sympathetic signals were recorded.
• Drift-diffusion models and cross-trial coherence analyses were employed.

Main Results:

• Participants exhibited approach-avoidance conflict when reward value neared cost aversion.
• Wider decision boundaries, indicative of increased evidence integration, were observed and associated with cardiac contractility.
• Neural dynamics (late alpha-band) and cardiac contractility showed synergistic effects, further widening decision boundaries during high conflict.

Conclusions:

• The cardiac-sympathetic nervous system plays a critical, collaborative role in managing approach-avoidance conflict.
• Autonomic influences may modulate information processing, potentially overriding reward sensitivity during conflict.
• This suggests a dynamic interplay between neural and autonomic systems in human decision-making under conflict.