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Heightened eating drive and visual food stimuli attenuate central nociceptive processing
Hazel Wright1, Xiaoyun Li1, Nicholas B Fallon1
1Department of Psychological Sciences, University of Liverpool, Liverpool, United Kingdom; and.
Journal of Neurophysiology
|December 6, 2014
Summary
Hunger temporarily reduces pain perception by altering brain activity. Viewing food images also decreases pain, suggesting the eating drive can dampen pain signals.
Area of Science:
- Neuroscience
- Psychology
- Human Physiology
Background:
- Hunger and pain are fundamental drives that can compete for behavioral priority.
- Understanding the neural mechanisms of this hunger-pain interaction is crucial for pain management and understanding motivated behavior.
Purpose of the Study:
- To investigate the cortical processes involved in the competition between hunger and pain.
- To examine how hunger state and visual food cues modulate pain processing in the brain.
Main Methods:
- Utilized 128-channel electroencephalography (EEG) and source dipole analysis of laser-evoked potentials (LEPs).
- Manipulated participants' hunger state (fasted vs. fed) and presented visual stimuli (food vs. inedible objects) alongside painful laser stimuli.
Main Results:
- Pain ratings were reduced when participants were hungry compared to when they were fed.
- Hunger state and viewing food-related images diminished cortical activity in pain-processing brain regions, including the operculo-insular cortex, anterior cingulate cortex, parahippocampal gyrus, and cerebellum.
Conclusions:
- Hunger and passive viewing of food cues can attenuate pain perception.
- These findings suggest an interaction between the motivational systems of eating and pain, where the drive to eat may modulate the processing of pain signals in the brain.
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