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Potential association between suicide risk, aggression, impulsivity, and the somatosensory system
Yoojin Lee1, Jessica R Gilbert1, Laura R Waldman1
1Experimental Therapeutics and Pathophysiology Branch, Intramural Research Program, National Institute of Mental Health, National Institutes of Health, Bethesda, MD 20892, United States.
Social Cognitive and Affective Neuroscience
|June 14, 2024
Summary
Magnetoencephalography (MEG) reveals altered brain activity in individuals experiencing a suicidal crisis. Reduced power and specific feedback disruptions in emotion regulation areas may serve as suicide risk markers.
Area of Science:
- Neuroscience
- Psychiatry
- Brain Imaging
Background:
- Aggression and impulsivity are associated with suicidal behaviors.
- The precise neural mechanisms linking these traits to acute suicidal crises require further investigation.
Purpose of the Study:
- To examine resting-state brain activity using magnetoencephalography (MEG) in individuals with varying suicide risk.
- To investigate the relationship between aggression, impulsivity, and brain power and connectivity in a high-risk suicidal group.
Main Methods:
- Magnetoencephalography (MEG) was used to record resting-state brain activity.
- Four groups were studied: high-risk (HR), lower-risk (LR), clinical control (CC), and minimal risk (MR).
- MEG power and functional connectivity, particularly glutamatergic feedback, were analyzed and correlated with self-reported aggression and impulsivity.
Main Results:
- No significant differences in overall resting-state MEG power were found between groups.
- High aggression and impulsivity in the HR group were associated with reduced MEG power in sensory and emotion regulation regions.
- The HR group exhibited downregulated glutamatergic feedback between the precuneus (PRE) and insula (INS) compared to other groups.
Conclusions:
- Glutamatergic-mediated sensory and emotion regulation processes show potential as neural markers for suicide risk.
- Specific alterations in brain connectivity, like reduced PRE-INS feedback, may be linked to suicidal crises and impulsivity.
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