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Altered thalamo-cortical resting state functional connectivity in smokers
Chaoyan Wang1, Jie Bai1, Caihong Wang1
1Department of Magnetic Resonance Imaging, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan Province, PR China.
Neuroscience Letters
|May 25, 2017
Summary
Smokers exhibit reduced thalamic functional connectivity with key brain regions involved in addiction. This finding offers new insights into the neural mechanisms underlying nicotine dependence and its impact on brain networks.
Area of Science:
- Neuroscience
- Addiction Research
- Functional Neuroimaging
Background:
- The thalamus plays a critical role in modulating prefrontal cortex (PFC) and striatal communication, essential for understanding smoking behaviors.
- Limited research has explored the resting-state functional connectivity (RSFC) of the thalamus in relation to smoking.
Purpose of the Study:
- To investigate differences in bilateral thalamic RSFC patterns between smokers and non-smokers.
- To examine the association between thalamic RSFC and smoking behaviors, including nicotine dependence and pack-years.
Main Methods:
- Utilized resting-state functional connectivity (RSFC) analysis in 24 young male smokers and 24 non-smokers.
- Assessed nicotine dependence using the Fagerström Test for Nicotine Dependence (FTND).
- Compared RSFC patterns between groups and correlated findings with smoking metrics.
Main Results:
- Smokers demonstrated reduced RSFC between the left thalamus and the right dorsolateral prefrontal cortex (dlPFC), anterior cingulate cortex (ACC), and bilateral caudate compared to non-smokers.
- The right thalamus showed decreased RSFC with the right dlPFC and bilateral insula in smokers.
- These reductions were observed in the context of nicotine addiction.
Conclusions:
- The study reveals diminished thalamic functional connectivity with the dlPFC, ACC, insula, and caudate in smokers.
- These findings highlight the thalamus's significant role in nicotine addiction through altered functional integration.
- Provides novel insights into the neural underpinnings of smoking behavior.
