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Brain Imaging and Behavior

, Volume 10, Issue 3, pp 911–919 | Cite as

Increased interhemispheric resting-state functional connectivity after sleep deprivation: a resting-state fMRI study

  • Yuanqiang Zhu
  • Zhiyan Feng
  • Junling Xu
  • Chang Fu
  • Jinbo Sun
  • Xuejuan Yang
  • Dapeng Shi
  • Wei Qin
Original Research

Abstract

Several functional imaging studies have investigated the regional effects of sleep deprivation (SD) on impaired brain function; however, potential changes in the functional interactions between the cerebral hemispheres after SD are not well understood. In this study, we used a recently validated approach, voxel-mirrored homotopic connectivity (VMHC), to directly examine the changes in interhemispheric homotopic resting-state functional connectivity (RSFC) after SD. Resting-state functional MRI (fMRI) was performed in 28 participants both after rest wakefulness (RW) and a total night of SD. An interhemispheric RSFC map was obtained by calculating the Pearson correlation (Fisher Z transformed) between each pair of homotopic voxel time series for each subject in each condition. The between-condition differences in interhemispheric RSFC were then examined at global and voxelwise levels separately. Significantly increased global VMHC was found after sleep deprivation; specifically, a significant increase in VMHC was found in specific brain regions, including the thalamus, paracentral lobule, supplementary motor area, postcentral gyrus and lingual gyrus. No regions showed significantly reduced VMHC after sleep deprivation. Further analysis indicates that these findings did not depend on the various sizes of smoothing kernels that were adopted in the preprocessing steps and that the differences in these regions were still significant with or without global signal regression. Our data suggest that the increased VMHC might reflect the compensatory involvement of bilateral brain areas, especially the bilateral thalamus, to prevent cognitive performance deterioration when sleep pressure is elevated after sleep deprivation. Our findings provide preliminary evidence of interhemispheric correlation changes after SD and contribute to a better understanding of the neural mechanisms of SD.

Keywords

Sleep deprivation Voxel mirrored homotopic connectivity Resting-state functional connectivity Thalamus FMRI 

Notes

Compliance with ethical standards

Funding

This study was financially supported by National Basic Research Program of China under Grant Nos. 2015CB856403, 2014CB543203 and 2012CB518501, the National Natural Science Foundation of China under Grant Nos. 81271644, 81471811, 81471738, 61401346, 81271534, 81160452 and 31200837, and the Fundamental Research Funds for the Central Universities.

Conflict of interest

All authors have indicated no financial conflicts of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the People’s Hospital of Zhengzhou University Subcommittee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

Informed consent was obtained from all individual participants included in the study.

Disclosure statement

This was not an industry supported study. The authors have indicated no financial conflicts of interest.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Yuanqiang Zhu
    • 1
  • Zhiyan Feng
    • 1
  • Junling Xu
    • 2
  • Chang Fu
    • 2
  • Jinbo Sun
    • 1
  • Xuejuan Yang
    • 1
  • Dapeng Shi
    • 2
  • Wei Qin
    • 1
  1. 1.Sleep and Neuroimage Group, School of Life Sciences and TechnologyXidian UniversityXi’anChina
  2. 2.Department of Nuclear MedicinePeople’s Hospital of Zhengzhou UniversityZhengzhouChina

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