Post-Attentive Integration and Topographic Map Distribution During Audiovisual Processing in Dyslexia: A P300 Event-Related Component Analysis

Abstract

Background Research on audiovisual post-attentive integration has been carried out using a variety of experimental paradigms and experimental groups but not yet studied in dyslexia. We investigated post-attentive integration and topographic voltage distribution in children with dyslexia by analysing the P300 event-related potential (ERP) component. Methods We used a 128-child ERP net for the ERP experiment. Two types of stimuli were presented as either congruent or incongruent stimuli. Congruent stimuli included a matching auditory sound with an animal image, whereas incongruent stimuli included unmatched animal sounds. A total of 24 age-matched children were recruited in the control ( n = 12) and dyslexia ( n = 12) groups. Children pressed button ‘1’ or ‘2’ when presented with congruent or incongruent stimuli, respectively. The P300 amplitudes and latencies with topographic voltage distribution were analysed for both groups. Results The dyslexia group evoked significantly higher P300 amplitudes at the T4 area than the control group. No significant differences were found in cases of P300 latency. Moreover, the dyslexia group demonstrated a higher intensity of P300 voltage distribution in the right parietal and left occipital areas than the control group. Conclusion Post-attentive integration for children with dyslexia is higher and that this integration process implicated the parietal and occipital areas.

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“…Post-attentional integration is higher in dyslexic children, involving the parietal and occipital regions. P300 latency showed no significant variations [45]. A previous study investigated the impact of the fatty acid ratio of linoleic (omega-6) to alpha-linolenic (omega-3) on cognitive performance in 2019.…”

“…According to Ali et al, the dyslexic group's P3 amplitudes at the T4 electrode were greater than the control group's in the right parietal and left occipital areas. In dyslexic children, both parietal and occipital areas were functional for the post-attentive process [45]. P300 is detectable in infants and appears to represent identical cognitive processes as in adults, although its peak latency is greatly delayed [12].…”

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“…P300 voltage distribution was higher in the dyslexia group than the control group in the right parietal and left occipital areas. Children with dyslexia had a higher rate of post-attentive integration, and this process involved the parietal and occipital areas [ 31 ].…”