Performance Dip in Motor Response Induced by Task-Irrelevant Weaker Coherent Visual Motion Signals
Performance Dip in Motor Response Induced by Task-Irrelevant Weaker Coherent Visual Motion Signals
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DOI：
10.1093/cercor/bhr270
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发表时间：
2012-08-01
期刊：
影响因子：
3.7
通讯作者：
Sasaki, Yuka
中科院分区：
文献类型：
--
作者：
Yotsumoto, Yuko;Seitz, Aaron R.;Sasaki, Yuka
表现下降是一种新表征的行为现象，矛盾的是，较弱的与任务无关的视觉刺激比较强的刺激对主要字母识别任务的准确性造成更大的干扰。了解绩效下降的机制可能有助于深入了解无意识行为。在这里，我们研究了性能下降的概括。具体来说，我们测试了性能下降是否发生在与运动相关的西蒙任务中，如果是，则性能下降是否涉及相同的大脑区域，即先前与性能下降有关的背外侧前额叶皮层（DLPFC），或与运动相关的西蒙任务有关的辅助运动区（SMA）和前SMA。受试者根据随机移动点的颜色做出手动方向响应，而忽略移动点的全局方向，这可能与适合主要任务的响应一致或不一致。我们发现，与任务无关的弱不一致刺激会导致表现下降，其中 SMA 和 pre-SMA（而不是 DLPFC）发挥了关键作用。我们的结果表明，不同神经回路之间可能存在一种共同的大脑机制，其中弱但不强的与任务无关的信息不受抑制，并侵入与主要任务相关的神经回路。
The Performance Dip is a newly characterized behavioral phenomenon, where, paradoxically, a weaker task-irrelevant visual stimulus causes larger disturbances on the accuracy of a main letter identification task than a stronger stimulus does. Understanding mechanisms of the Performance Dip may provide insight into unconsciousness behavior. Here, we investigated the generalization of the Performance Dip. Specifically, we tested whether the Performance Dip occurs in a motion-related Simon task, and if so, whether the Performance Dip involves the same brain region, that is, the dorsolateral prefrontal cortex (DLPFC), previously implicated in the Performance Dip, or the supplementary motor area (SMA) and pre-SMA, implicated in a motion-related Simon Task. Subjects made manual directional responses according to the color of stochastic moving dots while ignoring the global direction of moving dots, which could be either congruent or incongruent to the response appropriate to the main task. We found that weak incongruent task-irrelevant stimuli caused a Performance Dip, in which the SMA and pre-SMA, rather than DLPFC, played critical roles. Our results suggest a possible common brain mechanism across different neural circuits, in which weak, but not strong, task-irrelevant information is free from inhibition and intrudes into neural circuits relevant to the main task.