The abnormal reward network associated with insomnia severity and depression in chronic insomnia disorder

Jul 26, 2020Brain imaging and behavior

Changes in the brain’s reward system linked to how bad insomnia and depression are in long-term insomnia

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Circadian Biology on OpenScience ↗PubMed ↗DOI ↗

Abstract

Increased functional connectivity in the salience and limbic networks was found in patients with chronic insomnia disorder (CID) compared to healthy controls.

Patients with CID exhibited increased connectivity in the salience and limbic networks.
Decreased connectivity was noted in the default mode network and within the reward circuit in CID patients.
Reduced connectivity between the nucleus accumbens and the default mode network was linked to greater insomnia severity.
Altered connectivity within the reward network was associated with symptoms of depression in CID patients.
The findings suggest dysfunction in the reward network related to depression symptoms in CID.

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Previous research has shown that acute sleep deprivation can influence the reward networks. However, it is unclear whether and how the intrinsic reward network is altered in chronic insomnia disorder (CID). In the present study, we aimed to investigate whether the reward network is altered in patients with CID using resting-state functional magnetic resonance imaging (fMRI) data. Forty-two patients with CID and 33 healthy controls (HCs) were enrolled and underwent resting-state fMRI. Nucleus accumbens (NAc) - based functional connectivity (NAFC) was evaluated to explore the differences in the reward network between the CID and HC groups. Pearson correlation analysis was used to evaluate the clinical significance of altered NAFC networks. Compared to those in the HC group, increased NAFC was found in the salience and limbic networks, while decreased NAFC was found in the default mode network (DMN) and within the reward circuit in patients with CID. In addition, decreased FC between the NAc and DMN was associated with insomnia severity, while NAFC within the reward network was associated with depression symptoms in patients with CID. These findings showed that the reward network is dysfunctional and associated with depression symptom in patients with CID. Future studies of CID should consider both insomnia and depression symptoms to disentangle the role of insomnia and depression in the relationship under study.

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The abnormal reward network associated with insomnia severity and depression in chronic insomnia disorder

Abstract

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