Discrepancy of neural response between exogenous and endogenous task switching: an event-related potentials study
Discrepancy of neural response between exogenous and endogenous task switching: an event-related potentials study
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外源性和内源性任务切换之间神经反应的差异：事件相关电位研究
DOI：
10.1097/wnr.0b013e328354b066
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发表时间：
2012
期刊：
影响因子：
1.7
通讯作者：
Miyajima M
中科院分区：
文献类型：
--
作者：
Morioka N;Suekama K;Zhang FF;Kajitani N;Hisaoka-Nakashima K;Takebayashi M;Nakata Y.;Miyajima M
任务切换是一种众所周知的认知范式，用于探索任务集重构过程，如规则转移。特别是，内源性任务转换被认为与刺激触发的外源性任务转换有质的区别。然而，目前还没有研究考察内源性任务转换的神经基础。本研究旨在探讨线索刺激下外源性和内源性规则转换的事件相关电位反应的差异。我们修改了两种提示切换任务模式：外生（自下而上）规则切换和内生（自上而下）规则切换。在每个任务中，线索刺激被配置成诱导规则的切换或维持。在外生开关任务中，开关规则条件下的后期正偏转大于维持规则条件下的后期正偏转。然而，在内源性开关任务中，维持规则条件下的后期正偏转出乎意料地大于开关规则条件。这些结果表明，外生规则转换是显性刺激驱动的过程，而内源性规则转换是隐性的并行过程，不受外部刺激的影响。
Task switching is a well-known cognitive paradigm to explore task-set reconfiguration processes such as rule shifting. In particular, endogenous task switching is thought to differ qualitatively from stimulus-triggered exogenous task switching. However, no previous study has examined the neural substrate of endogenous task switching. The purpose of the present study is to explore the differences between event-related potential responses to exogenous and endogenous rule switching at cue stimulus. We modified two patterns of cued switching tasks: exogenous (bottom-up) rule switching and endogenous (top-down) rule switching. In each task cue stimulus was configured to induce switching or maintaining rule. In exogenous switching tasks, late positive deflection was larger in the switch rule condition than in the maintain rule condition. However, in endogenous switching tasks late positive deflection was unexpectedly larger in the maintain-rule condition than in the switch-rule condition. These results indicate that exogenous rule switching is explicit stimulus-driven processes, whereas endogenous rule switching is implicitly parallel processes independent of external stimulus.