CAJ | 학술논문

目的运用事件相关电位(event-related potentials, ERP)探讨顺序及计数任务加工的脑机制.方法 16名大学生针对呈现的双字母和参考数字图片分别完成字母顺序判断任务和字母间距与参考数字比较的计数任务, 同时记录其19通道ERP.采用2(任务:顺序、计数)×3(字母间距:1、2、3)两因素重复测量析因设计,ERP分析结果利用F值和t值的统计参数映像呈现.结果顺序任务的反应时间显著短于计数任务[F (1, 15)=502.43,P =0.00],前者正确率显著低于后者[F (1, 15)=52.96,P =0.00].计数任务行为绩效存在显著距离效应:三种字母间距的反应时间[(1710.6±176.6)ms,(2133.2±201.3)ms,(2437.3±198.9)ms]和正确率分别随字母间距加大而延长或降低.ERP统计参数映像显示:顺序任务的右前额颞和左额颞活动(350～800 ms)增强;计数任务的额顶网络活动(200～300 ms)增强,右顶颞活动(860～890 ms)与字母间距线性关联.结论顺序任务比计数任务执行更快但更易出错.前者ERP效应提示右侧半球提取和利用左侧半球存贮的字母顺序知识,反映了从记忆直接提取答案策略.后者的额顶ERP效应提示工作记忆机制的参与,右顶颞区ERP效应反映字母间距离效应和计数策略的应用.
목적 운용사건상관전위(event-related potentials, ERP)탐토순서급계수임무가공적뇌궤제.방법 16명대학생침대정현적쌍자모화삼고수자도편분별완성자모순서판단임무화자모간거여삼고수자비교적계수임무, 동시기록기19통도ERP.채용2(임무:순서、계수)×3(자모간거:1、2、3)량인소중복측량석인설계,ERP분석결과이용F치화t치적통계삼수영상정현.결과 순서임무적반응시간현저단우계수임무[F (1, 15)=502.43,P =0.00],전자정학솔현저저우후자[F (1, 15)=52.96,P =0.00].계수임무행위적효존재현저거리효응:삼충자모간거적반응시간[(1710.6±176.6)ms,(2133.2±201.3)ms,(2437.3±198.9)ms]화정학솔분별수자모간거가대이연장혹강저.ERP통계삼수영상현시:순서임무적우전액섭화좌액섭활동(350～800 ms)증강;계수임무적액정망락활동(200～300 ms)증강,우정섭활동(860～890 ms)여자모간거선성관련.결론 순서임무비계수임무집행경쾌단경역출착.전자ERP효응제시우측반구제취화이용좌측반구존저적자모순서지식,반영료종기억직접제취답안책략.후자적액정ERP효응제시공작기억궤제적삼여,우정섭구ERP효응반영자모간거리효응화계수책략적응용.
Objective To investigate neural correlates of both order and counting processes in mental arithmetic. Methods The behavioral performance and ERP were recorded from 16 undergraduate while they were performing alphabetical order and counting tasks. A two-factor design of repeated-measure was adopted with the task (order, counting) and the distance between letters (1,2,3). The statistical parametric mapping (SPM) of both F-value and t-value was presented for ERP. Results The reaction time of the counting task was significantly slower than that of the order task and the correction rate of the former was higher than the latter ( P =0.00). Distance effects were observed for behavioral performance of the counting task. The spatiotemporal pattern of SPM suggested the right prefrontal and the left frontal-temporal regions (350～800 ms) were significantly activated under order task. The frontoparietal network (200～300 ms) was specially activated under the counting condition. The right parietal-temporal cortex at 860～890 ms showed the distance effect. Conclusion The significant activation in the right frontal and the left hemisphere under the order task suggests the functional role of the right hemisphere as retrieval and utilizing knowledge of alphabetical order, which stored in the left hemisphere. The frontoparietal network effect in the counting task suggests that the executive mechanism of working memory involved. The distance effect occurring in the left occipital and the right parietal-temporal at 860～890 ms might reflect the counting strategy and problem-size effect in mental arithmetic.