An Event-related Potentials(ERP) Study Of Children's Visual-spatial Attention

Partâ… An event-related potentials study of healthy children's visual-spatial attentionObjective: To study the characteristic of healthy Children's Event-Related Potentials evoked by visual-spatial attention stimuli and to identify underlying neural electrophysiology mechanisms.Methods: We examined 30 8-year-old healthy children with two lists of visual-spatial attention stimulus (valid and invalid), which devised by our own. While the stimulus information being shown to participants, EEG and the behavioral performance were recorded simultaneously. ERPs were extracted from EEG and the components were analyzed by a Germany software which was called Besa.Result: There were no differences of the latencies of N1, P2, N2 between two lists of the stimulus at Fz,Cz,Pz,Oz. The N1 were enhanced by validly cued stimuli at PZ, Oz; and at all scalp sites above the P2 were enhanced by validly cued stimuli, in contrast, the N2 were enhanced by invalidly cued stimuli.Conclusion: In our study we found that with the visual-spatial attention stimuli the N1 was related with its location, the P2 and N2 were related with its scope, moreover, the N2 was also effected by the task, but the childen were easily interacted. This study had basic effects on the children's cognitive development of visual-spatial attention and clinic. Partâ…¡A preliminary experiment of visual-spatial attention in children with attention deficit hyperactivity disorder: an event-related potentials studyObjective: To explore the differences of the event-related potentials, which evoked by the visual-spatial stimuli between the children with attention-deficit hyperactivity disorder(ADHD) and the controls, and to identify underlying neural electrophysiology mechanisms, thus expecting the use of this pattern in ADHD.Methods: We examined 22 ADHD children with preliminary diagnosis in the same way as those controls above, also we compared and analysed the differences of ERP and the behavioral performance between the two groups.Result: The longer reaction time and the enhanced error rate with ADHD were one of the findings in this study. The others were those that by the validly cued stimuli, the P2 with a longer latency and equal amplitude at Fz, Cz, Pz, Oz, while the N2 with a shorter latency at Fz, Cz and laeger amplitude at Fz for ADHD versus the controls were found .Conclusion: The significant differences of the behaviors and ERP components, P2 and N2 which evoked by the visual-spatial stimuli between the ADHD and the controls suggested the neural mechanisms of attention-deficit in an electrophysiology device. The pattern used in this preliminary experiment would be useful in the future investigations in ADHD .