Delineating the neural signatures of tracking spatial position and working memory during attentive tracking.
Delineating the neural signatures of tracking spatial position and working memory during attentive tracking.
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DOI：
10.1523/jneurosci.1339-10.2011
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发表时间：
2011-01-12
期刊：
影响因子：
--
通讯作者：
Vogel EK
中科院分区：
文献类型：
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作者：
Drew T;Horowitz TS;Wolfe JM;Vogel EK
在注意力跟踪任务中，观察者跟踪多个物体，因为它们在视觉上相同的干扰物中独立且不可预测地移动。尽管许多注意力跟踪模型表明视觉工作记忆是负责表示目标位置的机制，但没有研究直接比较这两个任务的神经机制。在当前的一组实验中，我们使用电生理记录来描绘工作记忆和注意力跟踪所涉及的神经处理之间的相似性和差异。我们发现，对两项任务的对侧电生理反应对两项任务中参与的项目数量同样敏感，但也存在与跟踪过程中监测目标位置的过程相关的独特对侧负性。在跟踪任务期间，当物体短暂停止移动时，该信号会在一段时间内消失。这些结果提供的证据表明，在注意力跟踪期间，跟踪目标位置的过程会引起电生理反应，该反应与所关注的项目数量的神经测量不同且不可分离。
In the attentive tracking task, observers track multiple objects as they move independently and unpredictably among visually identical distractors. Although a number of models of attentive tracking implicate visual working memory as the mechanism responsible for representing target locations, no study has ever directly compared the neural mechanisms of the two tasks. In the current set of experiments, we used electrophysiological recordings to delineate similarities and differences between the neural processing involved in working memory and attentive tracking. We found that the contralateral electrophysiological response to the two tasks was similarly sensitive to the number of items attended in both tasks but that there was also a unique contralateral negativity related to the process of monitoring target position during tracking. This signal was absent for periods of time during tracking tasks when objects briefly stopped moving. These results provide evidence that, during attentive tracking, the process of tracking target locations elicits an electrophysiological response that is distinct and dissociable from neural measures of the number of items being attended.