诵读困难儿童的图形视觉诱发电位
Pattern Visual Evoked Potentials in Dyslexic Children.
作者信息
Shandiz Javad Heravian, Heyrani Mohsen, Sobhani-Rad Davood, Salehinejad Zeinab, Shojaei Shirin, Khoshsima Mohamad Javad, Azimi Abbas, Yekta Abbas Ali, Yazdi Seyed Hosein Hoseini
机构信息
Refractive Errors Research Center, Mashhad University of Medical Sciences, Mashhad, Iran.
Department of Optometry, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran.
出版信息
J Ophthalmic Vis Res. 2017 Oct-Dec;12(4):402-406. doi: 10.4103/jovr.jovr_106_16.
PURPOSE
This study aimed to compare pattern visual evoked potential (PVEP) components in dyslexic and normal children.
METHODS
This cross-sectional analytic study recruited 72 children, including 36 dyslexic and 36 normal participants aged 8-12 years. Visual examinations included measurement of distance visual acuity, refraction, and PVEP components of amplitudes and latencies with two different check sizes of 15 and 60 minutes (min) of arc at two contrast levels of 25% and 100%.
RESULTS
Our results demonstrated significant differences between dyslexic and normal children in terms of P100 latency and amplitude of PVEP at 25% contrast, with check sizes of 15 and 60 min of arc. However, there were no significant differences between the two groups regarding P100 latency and amplitude at 100% contrast with check sizes of both 15 and 60 min of arc.
CONCLUSION
Dyslexic participants showed reduced amplitude and prolonged latency in most PVEP components at low-contrast levels. These findings may support the magnocellular deficit hypothesis in dyslexic participants, even though the parvocellular pathway remains intact.
目的
本研究旨在比较诵读困难儿童和正常儿童的图形视觉诱发电位（PVEP）成分。
方法
这项横断面分析研究招募了72名儿童，包括36名8至12岁的诵读困难儿童和36名正常儿童。视力检查包括测量远视力、验光，以及在25%和100%两种对比度水平下，用15和60分视角两种不同检查尺寸测量PVEP的波幅和潜伏期成分。
结果
我们的结果表明，在25%对比度下，当检查尺寸为15和60分视角时，诵读困难儿童和正常儿童在PVEP的P100潜伏期和波幅方面存在显著差异。然而，在100%对比度下，当检查尺寸为15和60分视角时，两组在P100潜伏期和波幅方面没有显著差异。
结论
诵读困难参与者在低对比度水平下，大多数PVEP成分的波幅降低且潜伏期延长。这些发现可能支持诵读困难参与者的大细胞缺陷假说，尽管小细胞通路保持完整。
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