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Cognitive Neurodynamics

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07-03-2022 | Research Article

Extraction of discriminative features from EEG signals of dyslexic children; before and after the treatment

Authors: Anahita Oliaee, Maryam Mohebbi, Sepehr Shirani, Reza Rostami

Published in: Cognitive Neurodynamics | Issue 6/2022

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Abstract

Dyslexia is a neurological disorder manifested as difficulty reading and writing. It can occur despite adequate instruction, intelligence, and intact sensory abilities. Different electroencephalogram (EEG) patterns have been demonstrated between dyslexic and healthy subjects in previous studies. This study focuses on the difference between patients before and after treatment. The main goal is to identify the subset of features that adequately discriminate subjects before and after a specific treatment plan. The treatment consists of Transcranial Direct Current Stimulation (tDCS) and occupational therapy using the BrainWare SAFARI software. The EEG signals of sixteen dyslexic children were recorded during the eyes-closed resting state before and after treatment. The preprocessing step was followed by the extraction of a wide range of features to investigate the differences related to the treatment. An optimal subset of features extracted from recorded EEG signals was determined using Principal Component Analysis (PCA) in conjunction with the Sequential Floating Forward Selection (SFFS) algorithm. The results showed that treatment leads to significant changes in EEG features like spectral and phase-related EEG features, in various regions. It has been demonstrated that the extracted subset of discriminative features can be useful for classification applications in treatment assessment. The most discriminative subset of features could classify the data with an accuracy of 92% with SVM classifier. The above result confirms the efficacy of the treatment plans in improving dyslexic children's cognitive skills.

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Title: Extraction of discriminative features from EEG signals of dyslexic children; before and after the treatment
Authors: Anahita Oliaee
Maryam Mohebbi
Sepehr Shirani
Reza Rostami
Publication date: 07-03-2022
Publisher: Springer Netherlands
Published in: Cognitive Neurodynamics / Issue 6/2022
Print ISSN: 1871-4080
Electronic ISSN: 1871-4099
DOI: https://doi.org/10.1007/s11571-022-09794-2

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