Abstract:

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 (P3amp) 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 　P3PL,P3amp 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  P3amp 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  P3amp 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).ConclusionThe IAD  youngsters have cognition and sleep dysfunction,and the both factors can affect each other.

Key words: youngster, internet addiction disorder, cognition　disorders, sleep disorders