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EEG/MEG resting state activity in dyslexia: a systematic review
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Poster D48 in Poster Session D, Wednesday, October 25, 4:45 - 6:30 pm CEST, Espace Vieux-Port
This poster is part of the Sandbox Series.
Cherie Jenkins1, Lucia Cantonas1, Georgia Gerike1, Aino Sorsa1, Ariane Tretow1, Paavo Leppänen1, Jarmo Hämäläinen1; 1Univeristy of Jyväskylä
Developmental dyslexia (DD) is defined as a difficulty in learning to read despite normal intelligence, sensory acuity, and educational opportunities. A weakness in phonological awareness is implicated in DD. In parallel, differences in white matter connections within the language network have been observed in dyslexia. Specifically, the neuronal tracts that connect the left inferior frontal gyrus (IFG) to the posterior areas, the inferior parietal lobule (IPL) and visual word form area (VWFA), are affected, possibly resulting in hypoactivity within the posterior areas of the reading network, and hyperactivity in other brain areas due to compensation. Resting state differences in DD have been observed in research findings, and this systematic review is intended to compile and integrate these findings. We aim to build a comprehensive picture of brain activity in DD during rest using electroencephalography (EEG) and magnetoencephalography (MEG). EEG and MEG were selected due to their good temporal resolution allowing examination of the effects of DD on the frequency bands. Several different analysis methods have been used in the literature, and a systematic review is needed to understand the effect of these different methods and the reliability of findings in dyslexia-related resting state research. This review is currently underway. The 562 research papers found using our search terms were cut down to 25 peer reviewed research papers in a partially blinded two-step eligibility evaluation. The remaining papers are in the process of quality assessment using the AXIS appraisal tool for cross-sectional studies. The data extraction is also currently being carried out and will include the effects of DD on the main frequency bands, affected brain areas, effects on connectivity between these brain areas, and statistical significance. These research papers contain several different analysis methods, and we are currently examining different methods to combine the results into a comparable format. The main categories of methodology are power spectrum analysis, graph theory, and connectivity. The heterogeneous nature of the approaches and lack of parameter estimates reported preclude the possibility for meta-analysis.
Topic Areas: Disorders: Developmental, Reading