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Aberrant brain functional hubs and causal connectivity in presbycusis

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Abstract

To investigate resting-state connectivity and further understand directional aspects of implicit alterations in presbycusis patients, we used degree centrality (DC) and Granger causality analysis (GCA) to detect functional hubs of the whole-brain network and then analyze directional connectivity. Resting-state functional magnetic resonance imaging (fMRI) scans were performed on 40 presbycusis patients and 40 healthy controls matched for age, gender, and education. We used DC analysis and GCA to characterize abnormal brain networks in presbycusis patients. The associations of network centrality and directed functional connectivity (FC) with clinical measures of presbycusis were also examined according to the above results. We found that the network centrality of left frontal middle gyrus (MFG) was significantly lower than that of healthy control group. Unidirectionally, the left MFG revealed increased directional connectivity to the left superior frontal gyrus (SFG), while the left MFG exhibited decreased directional connectivity to the left middle temporal gyrus (MTG) and right lingual gyrus (LinG). And the decreased directional connectivity was found from the left precentral gyrus (PrCG) to the left MFG. In addition, the Trail-Making Test B (TMT-B) score was negatively correlated with the decreased DC of the left MFG (r = −0.359, p = 0.032). Resting-state fMRI provides a novel method for identifying aberrant brain network architecture. These results primarily indicate altered functional hubs and abnormal frontal lobe connectivity patterns that may further reflect executive dysfunction in patients with presbycusis.

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Funding

This work was supported by the National Natural Science Foundation of China (No. 81601477), Youth Medical Talents of Jiangsu Province (No. QNRC2016062), 14th “Six Talent Peaks” Project of Jiangsu Province (No. YY-079), Nanjing Outstanding Youth Fund (No. JQX17006), and 333 High-level Talents Training Project of Jiangsu Province (No. BRA2019122).

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Correspondence to Yuanqing Wu or Yuexin Cai.

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The authors declare that there is no potential conflict of interests regarding the publication of this paper.

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The current study was approved by the Research Ethics Committee of the Nanjing Medical University.

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

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Xing, C., Chen, YC., Tong, Z. et al. Aberrant brain functional hubs and causal connectivity in presbycusis. Brain Imaging and Behavior 15, 453–463 (2021). https://doi.org/10.1007/s11682-020-00386-4

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  • DOI: https://doi.org/10.1007/s11682-020-00386-4

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