Abstract
Idiopathic tinnitus can cause significant auditory-related brain structural and functional changes in patients. However, changes in patterns of the lateralization effects in idiopathic tinnitus have yet to be established, especially on white matter (WM) reorganization. In this study, we studied 19 left-sided and 19 right-sided idiopathic tinnitus (LSIT, RSIT) patients and 19 healthy controls (HCs). We combined applied voxel-based morphometry (VBM) and tract-based spatial statistics (TBSS) analyses to investigate altered features of the auditory-related brain WM. We also conducted correlation analyses between the clinical variables and WM changes in the patients. Compared with the HCs, both sided tinnitus patients showed significant auditory-related brain WM alterations. More interestingly, the LSIT patients demonstrated a greater decrease in white matter volume (WMV) in the right medial superior frontal gyrus (SFG) than the RSIT; meanwhile, we also found that compared with the RSIT group, the LSIT group showed significantly increased fractional anisotropy (FA) in the body of the corpus callosum (CC), left cingulum, and right superior longitudinal fasciculus (SLF) and decreased mean diffusivity (MD) in the body of CC. Moreover, relative to the RSIT group, the LSIT group also exhibited increases in WM axial diffusivity (AD) in the left SLF, left cingulum, right middle cerebellar peduncle (MCP), left thalamus, and bilateral forceps major (FM) and decreases in radial diffusivity (RD) in the genu of CC. Additionally, the FA value of the right SLF was closely associated with tinnitus severity in the LSIT. Our study suggests that lateralization has a significant effect on WM reorganization in patients with idiopathic tinnitus; in particular, LSIT patients may experience more severe and widespread alterations in WMV and WM microstructure than the RSIT group, and all these changes are indirectly auditory related. These findings provide new useful information that can lead to a better understanding of the tinnitus mechanisms.
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Data availability
The datasets generated for this study are available on request to the corresponding author.
Abbreviations
- LSIT:
-
left-sided idiopathic tinnitus
- RSIT:
-
right-sided idiopathic tinnitus
- HCs:
-
healthy controls
- VBM:
-
voxel-based morphometry
- DTI:
-
diffusion tensor imaging
- TBSS:
-
tract-based spatial statistics
- WMV:
-
white matter volume
- CSF:
-
cerebrospinal fluid
- THI:
-
tinnitus handicap inventory
- MNI:
-
Montreal Neurological Institute
- WMV:
-
white matter volume
- WM:
-
white matter
- FA:
-
fractional anisotropy
- MD:
-
mean diffusivity
- AD:
-
axial diffusivity
- RD:
-
radial diffusivity
- SFG:
-
superior frontal gyrus
- CC:
-
corpus callosum
- MCP:
-
middle cerebellar peduncle
- SLF:
-
superior longitudinal fasciculus
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Acknowledgements
The authors thank the patients and healthy volunteers who participated in this study and gave generously of their time.
Funding
This work was supported by Grant No.61801311, 61931013 from the National Natural Science Foundation of China, No. [2015] 160 from Beijing Scholars Program, Grant No. 7182044 from Beijing Natural Science Foundation, No. PX2018001 from Beijing Hospitals Authority, QML20180103 from Beijing Hospitals Authority Youth Programme, No. YYZZ2017B01 from Beijing Friendship Hospital, Capital Medical University, No. 2019M660717 from China Postdoctoral Science Foundation and No. 2020-Z2-023 from Beijing Postdoctoral Research Foundation.
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QC and HL* conducted the research project and conceived the study. QC wrote the manuscript. ZDW/XW/PFZ/ZHY/SSG provided technical and clinical support. HL* and ZCW* reviewed the manuscript and agree to be accountable for all aspects of the work.
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This study was approved by the Institutional Review Board (IRB) of Beijing Friendship Hospital, Capital Medical University (Beijing, China) (IRB number: 2016-P2-012), and written informed consent was obtained from each subject before the study in accordance with the Declaration of Helsinki.
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Chen, Q., Lv, H., Wang, Z. et al. Lateralization effects in brain white matter reorganization in patients with unilateral idiopathic tinnitus: a preliminary study. Brain Imaging and Behavior 16, 11–21 (2022). https://doi.org/10.1007/s11682-021-00472-1
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DOI: https://doi.org/10.1007/s11682-021-00472-1