注意缺陷多动障碍(ADHD)和发展性阅读障碍(DD)是儿童期常见的两种疾病，二者共患率高达25-40%。行为学研究发现拼音文字ADHD与DD共患的基础是加工速度缺陷，但其神经机制不清。汉语ADHD共患DD的加工速度研究未见报道。与DD有强烈相关的是注意缺陷型ADHD (ADHD-I型)，本研究以汉语ADHD-I型共患DD儿童为研究对象，纳入单纯ADHD-I型、单纯DD、健康对照儿童为三个对照组，每组50人。以非语言（符号）和语言（正字法、语音、语义）为实验材料，采用划销测验和ERP动态脑网络技术，通过比较共患组与各对照组在正确率、N1-P2-P3-N4潜伏期和动态网络连接的差异，探讨（1）汉语ADHD-I型共患DD儿童的核心缺陷（2）该缺陷是否有语言特异性（3）该缺陷的动态脑网络特征，深入了解ADHD共患DD的加工速度及其动态脑机制。本研究对ADHD共患DD儿童的辅助诊断有重要的指导作用。

Attention deficit hyperactivity disorders (ADHD) and developmental dyslexia (DD) are two common diseases during childhood, ADHD and DD co-occur with the high rate of 25-40%. Previous behavioral studies in alphabetic languages showed the basis of the comorbidity of ADHD and DD is the deficit of processing speed, however, its neural basis is unknown. In addition, few studies on the processing speed of comorbidity of ADHD and DD in Chinese is reported. Due to inattention type ADHD (ADHD-I type ) has strong correlation with DD, the current study, using Chaintest and ERP time-varying network, selected 50 children with comorbidity of ADHD-I and DD and 150 three control groups (50 ADHD-only, 50 DD-only, and 50 healthy controls) to reveal by comparing the accuracy, latency of N1-P2-P3-N4 components and connectivity value of time-varying networks in ERP: (1) the core deficit in comorbidity with ADHD and DD (2) is the deficit of processing speed language specific (3) the characteristics of time-varying networks in comorbidity with ADHD and DD. In this way we can detect characteristics and dynamic brain mechanism of processing speed in Chinese comorbidity with ADHD and DD more clearly. This research has an important guiding role for diagnosis on the comorbidity of ADHD and DD.