Objective To explore the changes of cognition and sleep status in the youngsters with internet addiction disorder (IAD), and to clarify the relation between cognition and sleep-related indicators of IAD youngsters.Methods Event related potential (ERP) and Pittsburgh Sleep Quality Index (PSQI)test were used for forty-two IAD (case group)and forty non-IAD (control group) in youngsters, and the indexes of period latency (PL)of N1 ,P2 ,N2 ,P3 and amplitude of P3 (P3 amp)of ERP were analyzed,the factor scores of sleep quality (SQ), sleep latency (SL), sleep time (ST), sleep efficiency (SE), sleep dysfunction (SD), sleeping pills (SP), daytime dysfunction (DD)and total score of PSQI were analyzed. The correlation between the P3 PL, P3 amp of ERP and all the indexes of PSQI in case group was analyzed.Results The PL of N2 ,P3 of ERP in case group was significanly longer and the P3 amp was significantly lower than those in control group (P<0.01);the factor scores of the SQ,SL,ST,SE,SD,DD,and the total score of PSQI test had significant differences between two groups (P<0.01).The correlation analysis results showed that there were remarkable positive correlations between the P3 PL and the factor seores of the SQ,SL,ST,SE,SD,DD and the total score of PSQI test in case group (r=0.46,0.34,0.51,0.40,0.48,and 0.54;P<0.01),and there were remarkable negative correlations betweeb P3 amp and the indexes of PSQI test in case group (r=-0.42,-0.45,-0.49,-0.38,-0.38,and -0.50;P<0.01).Conclusion The IAD youngsters have cognition and sleep dysfunction,and the both factors can affect each other.%目的：探讨青少年网络成瘾（IAD）者认知功能和睡眠状况的改变，阐明 IAD者认知与睡眠相关指标间的关系。方法：选取42例青少年 IAD者（病例组）和40例非成瘾者（对照组）分别进行事件相关电位（ERP）和匹兹堡睡眠质量指数（PSQI）测评， ERP 主要分析 N1、P2、N2、P3波潜伏期（PL）及 P3波幅（amp），PSQI主要分析睡眠质量（SQ）、入睡时间（SL）、睡眠时间（ST）、睡眠效率（SE）、睡眠障碍（SD）、催眠药物（SP）和日间功能障碍（DD）7个因子分及总分值，并将病例组 ERP 中 P3 PL、P3 amp 与 PSQI中的7个因子分及总分进行相关性分析。结果：与对照组比较，病例组 ERP 中的 N2和 P3波 PL延长（P＜0.01）， P3 amp降低（P＜0.01）；在PSQI测定的各因子得分中，与对照组比较，病例组 SQ、SL、ST、SE、SD、DD因子分和总分差异均有统计学意义（P＜0.01）。相关分析显示，病例组 P3 PL与 PSQI测定中 SQ、SL、ST、SE、SD、DD因子分和总分呈正相关关系（r分别为0.46、0.43、0.51、0.40、0.48和0.54，P＜0.01），而 P3 amp与以上各因子分和总分呈负相关关系（r分别为-0.42、-0.45、-0.49、-0.38、-0.38和-0.50，P＜0.01）。结论：青少年 IAD者存在一定程度的认知功能异常和睡眠障碍，且认知功能异常与睡眠障碍相互影响。
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