Motion induced N2 in normal and dyslexic Egyptian children: a neurophysiological pilot study

Abstract Introduction Dyslexia is a neurodevelopmental disorder characterized by poor reading despite normal cognitive skills. Impaired coherent motion perception was found in previous studies on dyslexic children. In this exploratory pilot study, we compared the neurophysiological response to visual coherent motion in normal readers and dyslexic children. Methods ERP of 10 dyslexic and 10 age and educational level matched controls were recorded while performing a motion coherence task. Results The dyslexia group showed a nominally significant longer occipital N2 latency in the intermediate coherence condition in comparison to controls. In within group comparison, dyslexics showed a disrupted response pattern of the studied regions of interest in response to intermediate and high coherence conditions. Conclusion given the small sample size and the lack of behavioral data, these results should be regarded as preliminary and hypothesis-generating. Larger sample studies are needed to investigate a longer occipital N2 latency in children with dyslexia during the intermediate coherence condition and the difference in N2 latency and amplitude across coherence conditions.