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Published on: July 1, 2014
Brain network mapping of structural and functional alterations associated with alexithymia.
Leyi Zhang1, Xuhan Cui1, Yangpan Ou1
1Department of Psychiatry, National Clinical Research Center for Mental Disorders, and National Center for Mental Disorders, The Second Xiangya Hospital of Central South University, Changsha, 410011, Hunan, China.
Neuroimaging reveals brain network alterations in alexithymia, linked to serotonin and acetylcholine transporter dysfunction. These findings offer insights into emotional awareness deficits and potential therapeutic targets.
Area of Science:
- Neuroscience
- Psychiatry
- Neuroimaging
Background:
- Alexithymia is associated with heterogeneous structural and functional brain alterations.
- Neuropsychiatric symptoms are increasingly understood as network-level phenomena.
- Limited research has explored alexithymia at the brain network level.
Purpose of the Study:
- To identify structural and functional brain networks associated with alexithymia.
- To investigate the relationship between alexithymia-related brain alterations and neurotransmitter systems.
- To elucidate the network-level neurobiological mechanisms underlying alexithymia.
Main Methods:
- Integrated findings from 43 neuroimaging publications on alexithymia.
- Applied functional connectivity network mapping (FCNM) to resting-state fMRI data (n=872).
- Correlated identified networks with neurotransmitter distribution maps (n>1200).
Main Results:
- Gray matter volume alterations predominantly involved subcortical, somatomotor, limbic, and ventral attention networks.
- Task-induced activation alterations mainly involved ventral attention, subcortical, and somatomotor networks.
- Both networks showed significant correlations with serotonin and vesicular acetylcholine transporters.
Conclusions:
- Alexithymia is characterized by widespread brain network dysfunction, particularly in emotional awareness pathways.
- Observed alterations may be linked to serotonergic and vesicular acetylcholine transporter dysfunction.
- Identified networks may serve as therapeutic targets and biomarkers for alexithymia.
