Are the perceptual biases found in chimeric face processing reflected in eye-movement patterns?
Are the perceptual biases found in chimeric face processing reflected in eye-movement patterns?
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DOI：
10.1016/j.neuropsychologia.2004.06.005
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发表时间：
2005-01-01
期刊：
影响因子：
2.6
通讯作者：
Harvey, M
中科院分区：
文献类型：
--
作者：
Butler, S;Gilchrist, ID;Harvey, M
对患有局灶性脑损伤的患者和神经影像学的研究表明，面部处理主要基于右半球功能。此外，使用嵌合面部（面部的左侧和右侧不同）进行的实验表明，观察者倾向于将他们的反应偏向左侧的信息。在这里，我们使用整个面部和嵌合（一半女性，一半男性）面部的混合面部图像来监测性别识别任务期间的眼球运动[Neuropsychologia 35 (1997) 685]。正如预期的那样，我们发现了左侧知觉偏差：受试者更频繁地根据嵌合面孔的左侧做出性别决定。对第一次扫视的分析显示，与知觉偏差无关的左侧注视数量显着增加，这可能反映了首先检查更适合面部分析的面部侧面（面部左侧/右半球）的倾向。最重要的是，反应和注视模式之间存在关系。在试验中，参与者表现出左侧知觉偏差，他们产生了明显更多的左侧眼跳，并且注视左侧的时间更长。相比之下，对于参与者表现出右侧知觉偏差的试验，左侧或右侧的数量或总注视持续时间之间没有可靠的差异。这些结果表明，在逐项试验的基础上，左侧或右侧扫描范围的细微差异与参与者的知觉反应有关，尽管与反应偏差无关，总体初始注视偏差会发生在左侧。 (C) 2004 Elsevier Ltd. 保留所有权利。
Studies of patients with focal brain lesions and neuroimaging indicate that face processing is predominantly based on right hemisphere function. Additionally, experiments using chimeric faces, where the left and the right-hand side of the face are different, have shown that observers tend to bias their responses toward the information on the left. Here, we monitored eye-movements during a gender identification task using blended face images for both whole and chimeric (half female, half male) faces [Neuropsychologia 35 (1997) 685]. As expected, we found a left perceptual bias: subjects based their gender decision significantly more frequently on the left side of the chimeric faces.Analysis of the first saccade showed a significantly greater number of left fixations independent of perceptual bias presumably reflecting the tendency to first inspect the side of the face better suited to face analysis (left side of face/right hemisphere). On top of this though, there was a relationship between response and fixation pattern. On trials where participants showed a left perceptual bias they produced significantly more left saccades and fixated for longer on the left. In contrast, for trials where participants showed a right perceptual bias there was no reliable difference between the number, or total fixation duration, on the left or the right.These results demonstrate that on a trial-by-trial basis subtle differences in the extent of left or right side scanning are related to the perceptual response of the participant, although an overall initial fixation bias to the left occurs irrespective of response bias. (C) 2004 Elsevier Ltd. All rights reserved.