Background:A number of theoretical accounts have been put forward to explain the ability to simultaneously track multiple visually indistinguishable objects over a period of time. Serial processing models of visual tracking focus on the maintenance of the spatial locations of every single item overtime. A more recent mechanism describes multiple object tracking as the ability to maintain a higher order representation of an abstract spatial configuration built by the illusory connection of the tracked items through their transition. Objective:The current study investigates the correspondence between these serial and parallel tracking accounts and the right hemispheric specialization for the space-based vs. left hemispheric for object-based attentional processing. Methods:Electrophysiological brain responses were recorded in two groups of patients with right- and left hemispheric lesions while performing in a multiple object tracking task. Results:The results suggest a failure to distinguish single item information for the right hemispheric patients accompanied by the absence of a known electrophysiological marker associated with single item tracking. Importantly, left hemispheric patients showed a graded behavioral and electrophysiological response to probe stimuli as a function of the congruence of the probe with the relevant target stimuli. Conclusions:The current data suggest that the differential contribution of serial and parallel tracking mechanisms during object tracking can partly be explained by the different functional contributions of the right and left brain hemispheres.

中文翻译：

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基于半球不对称性的多目标跟踪机制的功能分离

背景：已经提出了许多理论解释来解释在一段时间内同时跟踪多个视觉上无法区分的物体的能力。视觉跟踪的串行处理模型侧重于维护每个单项加班的空间位置。一种更新的机制将多对象跟踪描述为能够保持抽象空间配置的高阶表示，这些配置由被跟踪项目通过它们的过渡的虚幻连接而构建。目的：当前的研究调查了这些串行和并行跟踪帐户与基于空间的右半球与用于基于对象的注意处理的左半球专业化之间的对应关系。方法：在执行多目标跟踪任务时，记录了两组患有左右半球病变的患者的脑电生理反应。结果：结果表明无法区分右半球患者的单个项目信息，同时缺乏与单个项目跟踪相关的已知电生理标记。重要的是，左半球患者对探针刺激表现出分级的行为和电生理反应，这是探针与相关目标刺激的一致性的函数。结论：目前的数据表明，对象跟踪过程中串行和并行跟踪机制的不同贡献可以部分解释为左右脑半球的不同功能贡献。