Shifting attention in viewer- and object-based reference frames after unilateral brain injury.
Shifting attention in viewer- and object-based reference frames after unilateral brain injury.
复制标题
单侧脑损伤后，注意力转移到基于观察者和基于物体的参考系中。
DOI：
10.1016/j.neuropsychologia.2011.04.003
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发表时间：
2011
期刊：
影响因子：
2.6
通讯作者：
Schendel,Krista
中科院分区：
文献类型：
--
作者：
List,Alexandra;Landau,AyeletN;Brooks,JosephL;Flevaris,AnastasiaV;Fortenbaugh,FrancescaC;Esterman,Michael;VanVleet,ThomasM;Albrecht,AliceR;Alvarez,BryanD;Robertson,LynnC;Schendel,Krista
本研究的目的是探讨基于对象和基于观众的参考框架在视觉注意力重定向中的各自作用，并评估它们在单侧脑损伤后的影响。为此，我们研究了16例右半球损伤（RHI）和13例左半球损伤（LHI）患者。我们使用线索设计来操纵线索和目标相对于由两个矩形（即物体）组成的显示的位置。与以往对患者的研究不同，我们在中线而不是在左或右视野中呈现所有线索。因此，在目标横向呈现的关键条件下，注意力的重新定向总是来自中线提示。作为基于观看者（对侧和同侧）和基于对象（需要在对象内或对象之间重新定向）参考框架的函数，测量了横向目标检测的性能。正如预期的那样，患者的对侧检测比同侧检测慢。更重要的是，目标在对视场和同视场对目标检测的影响是不同的。相反，重新定向到提示对象内的目标比重新定向到相同位置但未提示对象内的目标花费的时间更长。这一发现与基于对象的忽视一致。通常情况下，结果是相反的。此外，在患者组之间（RHI与LHI），没有发现基于对象的影响有显著差异。这些发现在参考框架的背景下进行讨论，用于重新定向注意力的目标检测。
The aims of the present study were to investigate the respective roles that object- and viewer-based reference frames play in reorienting visual attention, and to assess their influence after unilateral brain injury. To do so, we studied 16 right hemisphere injured (RHI) and 13 left hemisphere injured (LHI) patients. We used a cueing design that manipulates the location of cues and targets relative to a display comprised of two rectangles (i.e., objects). Unlike previous studies with patients, we presented all cues at midline rather than in the left or right visual fields. Thus, in the critical conditions in which targets were presented laterally, reorienting of attention was always from a midline cue. Performance was measured for lateralized target detection as a function of viewer-based (contra- and ipsilesional sides) and object-based (requiring reorienting within or between objects) reference frames. As expected, contralesional detection was slower than ipsilesional detection for the patients. More importantly, objects influenced target detection differently in the contralesional and ipsilesional fields. Contralesionally, reorienting to a target within the cued object took longer than reorienting to a target in the same location but in the uncued object. This finding is consistent with object-based neglect. Ipsilesionally, the means were in the opposite direction. Furthermore, no significant difference was found in object-based influences between the patient groups (RHI vs. LHI). These findings are discussed in the context of reference frames used in reorienting attention for target detection.