CAJ | 학술논문

目的探讨在认知活动中左右脑对左右视场(LVF,RVF)信号的反应特性. 方法对23名被试者在3种任务条件下9个部位的与LVF和RVF相应的事件关联电位(ERPs)进行了比较.刺激信号为位于LVF和RVF中的红、绿闪光,等概率随机出现,交叉地规定红或绿闪光为靶信号(T).3种任务是:视对照(VC);简单选择反应(SR);选择区分反应(DR),对LVF和RVF的T分别向左和右拨开关. 结果 (1)除外源性的P1和N1成分外,与LVF和RVF相应的ERPs的差别突出地表现在左额区(F5),即在SR和DR条件下RVF的T-ERPs及NT-ERPs中出现显著的负慢波,而右脑对信号的方位不敏感;(2)左右脑对LVF和RVF信号反应的不对称性与认知状态有关:靶信号时与对侧视场相应的ERPs左脑比右脑显著偏负,而非靶信号则是与同侧视场相应的ERPs在左、右脑出现显著差别,且是右脑(F5,C5)偏负. 结论左右脑对靶和非靶信号的反应不同提示二者在信号加工过程中的不同功能;左额区对RVF中靶和非靶信号的负慢电位反应提示右视场中具有心理意义的信号可能引起较大的心理负荷.
목적탐토재인지활동중좌우뇌대좌우시장(LVF,RVF)신호적반응특성. 방법대23명피시자재3충임무조건하9개부위적여LVF화RVF상응적사건관련전위(ERPs)진행료비교.자격신호위위우LVF화RVF중적홍、록섬광,등개솔수궤출현,교차지규정홍혹록섬광위파신호(T).3충임무시:시대조(VC);간단선택반응(SR);선택구분반응(DR),대LVF화RVF적T분별향좌화우발개관. 결과 (1)제외원성적P1화N1성분외,여LVF화RVF상응적ERPs적차별돌출지표현재좌액구(F5),즉재SR화DR조건하RVF적T-ERPs급NT-ERPs중출현현저적부만파,이우뇌대신호적방위불민감;(2)좌우뇌대LVF화RVF신호반응적불대칭성여인지상태유관:파신호시여대측시장상응적ERPs좌뇌비우뇌현저편부,이비파신호칙시여동측시장상응적ERPs재좌、우뇌출현현저차별,차시우뇌(F5,C5)편부. 결론좌우뇌대파화비파신호적반응불동제시이자재신호가공과정중적불동공능;좌액구대RVF중파화비파신호적부만전위반응제시우시장중구유심리의의적신호가능인기교대적심리부하.
Objective To study the response characteristics of left and right brain to signals from left(LVF) and right(RVF) visual fields during cognitive activity. Method ERPs at 9 locations to LVF and RVF signals were compared in 23 normal subjects in 3 task conditions:looking forward only (VC); making switch response to target signals(T) only(SR); making switch response to T differentially(DR). Result (1)Significant difference in ERPs was found between that induced by LVF and RVF signals on left brain especially at frontal location(F5), which appeared as slow negative deflection induced by T and NT from RVF in SR and DR;(2) Condition-dependent unsymmetrical features between left and right brain were found: the slow potential at F5 was significantly more negative in T and contralateral spatial relation(i.e., left brain for RVF) but more positive in NT and ipsilateral relation than that at F6.Conclusion Signals with psychological meaning in RVF might cause more psychological load as suggested by the results obtained in this study.