Perceived gaze direction in faces and spatial attention: a study in patients with parietal damage and unilateral neglect.
Perceived gaze direction in faces and spatial attention: a study in patients with parietal damage and unilateral neglect.
复制标题
面部感知注视方向和空间注意力：一项针对顶叶损伤和单侧忽视患者的研究。
DOI：
10.1016/s0028-3932(01)00153-1
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发表时间：
2002
期刊：
影响因子：
2.6
通讯作者：
Vuilleumier,P
中科院分区：
文献类型：
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作者：
Vuilleumier,P
面孔注视是影响正常人注意定向的重要社会信号。这种凝视效应是否仍然会发生在右顶叶损伤和左侧忽视的患者身上，他们通常无法注意到病灶对侧空间？两个实验测试了感知凝视对视觉消退的影响。脸或形状刺激，提出了在右，左，或两个半野，与脸要么直视前方或朝向相反的领域。在双侧试验中，当同时出现的右脸看向前方而不是正前方时，患者消除左脸形状的几率要小得多。这种情况发生，即使凝视是不相关的任务和面部信号的处理暗示注意到一个竞争性的isilesional刺激。相比之下，在左侧呈现的面孔中，凝视对消退没有影响，这表明凝视线索在没有注意的情况下不会被提取。另外两个实验研究了感知凝视对检测外围目标的影响。目标出现在四个可能的位置之一的右侧或左侧的一个中心面看向目标位置，另一个位置在同一侧，对面，或正前方。面部和目光与任务无关，也不能预测目标位置。患者反应更快时，面对着对侧和同侧病灶的目标。在对侧空间，凝视允许转移注意力在一个特定的象限方向，但只有第一个目标沿着扫描路径时，有不同的可能位置在同一侧。相比之下，在完整的同病灶空间，注意力被选择性地指向不同的偏心位置之一。控制实验表明，象征性的箭头线索并没有产生类似的效果。这些结果表明，即使顶叶损伤导致空间忽视和损害的位置对contralesional侧的代表性，在脸上感知凝视仍然可以触发自动转移的注意力在contralesional方向，这表明存在特定的和解剖学上不同的注意机制。
Perceived gaze in faces is an important social signal that may influence orienting of attention in normal observers. Would such effects of gaze still occur in patients with right parietal damage and left neglect who usually fail to attend to contralesional space? Two experiments tested for effects of perceived gaze on visual extinction. Face or shape stimuli were presented in the right, left, or both hemifields, with faces looking either straight ahead or toward the opposite field. On bilateral trials, patients extinguished a left shape much less often when a concurrent right face looked leftward rather than straight ahead. This occurred, even though gaze was not relevant to the task and processing of facial signals implied attention to a competing ipsilesional stimulus. By contrast, rightward gaze in faces presented on the left side had no effect on extinction, suggesting that gaze cues are not extracted without attention. Two other experiments examined effects of perceived gaze on the detection of peripheral targets. Targets appeared at one of four possible locations to the right or left of a central face looking either toward the target location, another location on the same side, the opposite side, or straight ahead. Face and gaze were not relevant to the task and not predictive of target location. Patients responded faster when the face looked toward the target on both the contralesional and ipsilesional sides. In contralesional space, gaze allowed shifting of attention in a specific quadrant direction, but only to the first target along the scan path when there were different possible locations on the same side. By contrast, in intact ipsilesional space, attention was selectively directed to one among different eccentric locations. Control experiments showed that symbolic arrow cues did not produce similar effects. These results indicate that even though parietal damage causes spatial neglect and impairs the representation of location on the contralesional side, perceived gaze in faces can still trigger automatic shifts of attention in the contralesional direction, suggesting the existence of specific and anatomically distinct attentional mechanisms.