| Summary: | 碩士 === 國立成功大學 === 體育健康育與休閒研究所 === 96 === Children with developmental coordination disorder (DCD) were demonstrated that they have the slower reaction time when executing the endogenous visuospatial attention during the Posner paradigm task. Therefore, the purpose of this study was to identify and compare attentional, decisional, and motor processing stages of brain activity, as revealed by event-related potentials (ERPs) concurring with lower response ability in children with DCD and typically developing children. In the present study, behavioral performance and ERPs measures were recorded and compared during a variant of the endogenous Posner paradigm in 15 children with DCD, along with 15 typically developing children, aged 9-10 years and identified with Movement Assessment Battery for Children. Data were analyzed statistically by a mixed design, factorial, and repeated-measures analysis of variance (ANOVA). The results showed that：(1) children with DCD had significantly longer reaction time than typically developing children whatever the cue-target combination; and (2) the electrophysiological characteristics also showed distinctively reflective waveforms in children with DCD: longer cue-P3 latency, smaller target-P3 amplitude at the Oz lead, and an elongated interval between target-N2 and the motor response. The main mechanism on slower reaction time in children with DCD was suggested that they had longer Cue-P3, and needed more time to make strategic decision and to execute behavioural performance. Further corroborative research, such as electromyography coupled with ERPs and behavioural performance, will no doubt help to address the explicit mechanism of motor impairment in children with DCD.
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