Resting state EEG signal analysis in Indian Dyslexic children

Developmental Dyslexia is the most common learning disability associated with the difficulty in reading skills even with normal intelligence. The present study analyzed the resting state (eyes closed) 19 channel EEG recordings in 15 Indian dyslexic children and 15 normal children. Node strength for each electrode location for all major EEG bands (delta, theta, alpha, and beta) was calculated for both groups and compared. Results showed increased (p<0.05) delta/theta node strength in temporal, parietal, frontal and occipital regions during rest in the dyslexic group. Also, the dyslexic group showed decreased (p<0.05) alpha/beta node strength at right temporal, prefrontal and left central brain areas. The control group showed decreased (p<0.05) delta/theta node strength at temporal, parietal, occipital and frontal regions and increased (p<0.05) alpha/beta node strength at the right parietal and frontal regions. The present study concludes with the finding of increased theta activity during rest condition (eyes closed) as a strong biomarker for the existence of resting-state functional abnormalities in dyslexic children at temporal, parietal and occipital regions.