CAJ | 학술논문

目的利用事件相关电位( event-related potentials,ERP)时空模式探讨短暂任务线索消除任务切换代价的神经机制.方法 19名被试依据不同长/短时程( 1000/100 ms)呈现的线索,按键分别完成中文Stroop颜色单字词的词义或颜色判断任务,连续两个任务之间存在两类接替关系:同类任务重复和异类任务切换.对行为绩效和19通道ERP均行2(线索时程:长/短)×2(任务接替:重复/切换)重复测量方差分析.结果反应时切换代价(切换减去重复):短线索[ (0.80 ±40.7) ms]与长线索[(15.0±33.3)ms]差异存在显著趋势(t(18)=-1.77,P=0.09).正确率切换代价的差异无统计学意义.ERP统计参数映像提示:在线索加工阶段,线索主效应先后出现在前额-后枕区(1 00 ～ 200 ms)、额顶-颞枕区(200～500 ms)以及额顶网络-枕区(500 ～ 900 ms).在任务执行阶段,线索主效应先后出现在左侧额区(300 ～400 ms)和顶枕区(400～ 900 ms)；任务主效应起始于右侧(500 ～ 600 ms)并扩散至双侧(600 ～ 900 ms)额中央顶颞区.结论短暂线索不仅在线索加工阶段可早期启动额顶网络的准备,而且在任务执行阶段促进左侧额叶对线索的提取和利用.
목적 이용사건상관전위( event-related potentials,ERP)시공모식탐토단잠임무선색소제임무절환대개적신경궤제.방법 19명피시의거불동장/단시정( 1000/100 ms)정현적선색,안건분별완성중문Stroop안색단자사적사의혹안색판단임무,련속량개임무지간존재량류접체관계:동류임무중복화이류임무절환.대행위적효화19통도ERP균행2(선색시정:장/단)×2(임무접체:중복/절환)중복측량방차분석.결과 반응시절환대개(절환감거중복):단선색[ (0.80 ±40.7) ms]여장선색[(15.0±33.3)ms]차이존재현저추세(t(18)=-1.77,P=0.09).정학솔절환대개적차이무통계학의의.ERP통계삼수영상제시:재선색가공계단,선색주효응선후출현재전액-후침구(1 00 ～ 200 ms)、액정-섭침구(200～500 ms)이급액정망락-침구(500 ～ 900 ms).재임무집행계단,선색주효응선후출현재좌측액구(300 ～400 ms)화정침구(400～ 900 ms)；임무주효응기시우우측(500 ～ 600 ms)병확산지쌍측(600 ～ 900 ms)액중앙정섭구.결론 단잠선색불부재선색가공계단가조기계동액정망락적준비,이차재임무집행계단촉진좌측액협대선색적제취화이용.
Objective To investigate the neural mechanism of the reduction of switch cost induced by short presentation of the task cue.Methods The event-related potentials (ERP) was recorded from 19 subjects while they performed a Chinese Stroop switching task.The factorial design of repeated-measures was adopted with the cue presentation time (100/1000 ms) and the type of succeeding task (repeat/switch).Results For the switch cost of reaction time (the switch subtracts the repeat),the difference between the long cue group (15.0 ± 33.3 ms) and the short group (0.80 -±40.7 ms) had the significantly tendency( t (18) =- 1.77,P=0.09).During the stage of cue processing,the ERP effects of cue reveal in the frontal-occipital areas ( 100 ～ 200 ms),frontoparietal and tempo-occipital regions (200 ～500 ms),frontoparietal network and centro-occipital regions (500 ～900ms).During the stage of task execution,the ERP effects of the cue were observed from the left fronto-occipital areas ( 300 ～ 400 ms) to parieto-occipital areas (400 ～ 900 ms).The ERP effects of the task started from the right hemisphere (500 ～600 ms ) and extended to bilateral prefrontal and centro-parietal area (600 ～900 ms ).Conclusion The short cue presentation can not only start up the preparation of frontoparietal network earlier during cue processing stage but also enhance its retrieval in the left dorsal lateral frontal cortex during task executive stage.