中国神经再生研究(英文版) ›› 2021, Vol. 16 ›› Issue (4): 734-743.doi: 10.4103/1673-5374.295334

• 原著:脑损伤修复保护与再生 • 上一篇    下一篇

视觉语义任务训练后发育 性阅读障碍患儿的脑电图网络变化:一项前瞻性病例对照研究

  

  • 出版日期:2021-04-15 发布日期:2020-12-21
  • 基金资助:
    保加利亚教育和科学部国家科学基金资助(DN05/14-2016)

Altered electroencephalographic networks in developmental dyslexia after remedial training: a prospective case-control study

Juliana A. Dushanova*, Stefan A. Tsokov   

  1. Institute of Neurobiology, Bulgarian Academy of Sciences, Sofia, Bulgaria
  • Online:2021-04-15 Published:2020-12-21
  • Contact: Juliana A. Dushanova, PhD, juliana@bio.bas.bg.
  • Supported by:
    The study was supported by the National Science Fund of the Ministry of Education and Science (project DN05/14-2016, to JAD).

摘要:

已有脑电图研究使用图论分析法发现了发育障碍儿童的功能连接异常。然而,尚不清楚视觉任务训练如何改变发育性阅读障碍语义网络的功能连接性。此次前瞻性病例对照研究试图对比21名健康对照与22例阅读障碍患儿(8-9岁)之间视觉语义任务训练前后功能网络的局部和全局拓扑性质的差异。最小生成树方法用于构建视觉单词/伪单词区分任务期间多个脑电图频率范围内受试者的大脑网络。4种图形测量的θ,α,β和γ波谱结果显示,与对照组相比,在训练之前阅读障碍患儿的网络拓扑更加完整。训练后,阅读障碍儿童的网络拓扑隔离更为明显,与对照组相似。与对照组相比,在θ,α和β1波谱中,训练前阅读障碍症患者左前颞区和顶叶区的点度中心性和中介中心性降低。对照组儿童网络拓扑特征中,左侧颞叶和顶叶α,β1波谱,颞叶和上额叶皮层θ,α波谱,顶叶和枕颞叶皮质β1波谱同时出现,而这些特征在阅读障碍患儿的大脑网络中未见。训练后,阅读障碍患儿θ和β1波谱中心分布已与对照组相似。研究结果表明,发育性阅读障碍患儿大脑网络工作效率低。这是首个关于保加利亚发育性阅读障碍儿童功能性大脑网络的拓扑研究。

https://orcid.org/0000-0002-0253-6568 (Juliana A. Dushanova)

Abstract: Electroencephalographic studies using graph theoretic analysis have found aberrations in functional connectivity in children with developmental dyslexia. However, how the training with visual tasks can change the functional connectivity of the semantic network in developmental dyslexia is still unclear. We looked for differences in local and global topological properties of functional networks between 21 healthy controls and 22 dyslexic children (8–9 years old) before and after training with visual tasks in this prospective case-control study. The minimum spanning tree method was used to construct the subjects’ brain networks in multiple electroencephalographic frequency ranges during a visual word/pseudoword discrimination task. We found group differences in the theta, alpha, beta and gamma bands for four graph measures suggesting a more integrated network topology in dyslexics before the training compared to controls. After training, the network topology of dyslexic children had become more segregated and similar to that of the controls. In the θ, α and β1-frequency bands, compared to the controls, the pre-training dyslexics exhibited a reduced degree and betweenness centrality of the left anterior temporal and parietal regions. The simultaneous appearance in the left hemisphere of hubs in temporal and parietal (α, β1), temporal and superior frontal cortex (θ, α), parietal and occipitotemporal cortices (β1), identified in the networks of normally developing children was not present in the brain networks of dyslexics. After training, the hub distribution for dyslexics in the theta and beta1 bands had become similar to that of the controls. In summary, our findings point to a less efficient network configuration in dyslexics compared to a more optimal global organization in the controls. This is the first study to investigate the topological organization of functional brain networks of Bulgarian dyslexic children. Approval for the study was obtained from the Ethics Committee of the Institute of Neurobiology and the Institute for Population and Human Studies, Bulgarian Academy of Sciences (approval No. 02-41/12.07.2019) on March 28, 2017, and the State Logopedic Center and the Ministry of Education and Science (approval No. 09-69/14.03.2017) on July 12, 2019.