Fixation and saliency during search of natural scenes: The case of visual agnosia
Fixation and saliency during search of natural scenes: The case of visual agnosia
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DOI：
10.1016/j.neuropsychologia.2009.03.013
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发表时间：
2009-07-01
期刊：
影响因子：
2.6
通讯作者：
Underwood, Geoffrey
中科院分区：
文献类型：
--
作者：
Foulsham, Tom;Barton, Jason J. S.;Underwood, Geoffrey
自然场景中的眼球运动控制模型通常区分刺激驱动的过程（引导眼睛到达视觉显着区域）和基于任务和对象知识的过程（取决于对象和场景要点的期望或识别）。在本次调查中，记录了一名视觉失认症患者在自然场景照片中寻找物体时的眼球运动，并将其与学生和年龄匹配的对照者的眼球运动进行了比较。失认症被认为会破坏这项任务中自上而下的知识，因此可能会增加对自下而上线索的依赖。患者在物体识别方面的缺陷表现为搜索性能差和扫描效率低。目标物体的低显着性对视觉失认症的反应有影响，场景中最显着的区域更有可能被患者注视而不是被对照组注视。对模型预测的注视位置显着性的分析表明，失认症患者的注视和低水平显着性比对照组更接近。这些发现与显着性图模型以及眼睛引导中高水平因素和低水平因素之间的平衡进行了讨论。 (C) 2009 Elsevier Ltd. 保留所有权利。
Models of eye movement control in natural scenes often distinguish between stimulus-driven processes (which guide the eyes to visually salient regions) and those based on task and object knowledge (which depend on expectations or identification of objects and scene gist). In the present investigation, the eye movements of a patient with visual agnosia were recorded while she searched for objects within photographs of natural scenes and compared to those made by students and age-matched controls. Agnosia is assumed to disrupt the top-down knowledge available in this task, and so may increase the reliance on bottom-up cues. The patient's deficit in object recognition was seen in poor search performance and inefficient scanning. The low-level saliency of target objects had an effect on responses in visual agnosia, and the most salient region in the scene was more likely to be fixated by the patient than by controls. An analysis of model-predicted saliency at fixation locations indicated a closer match between fixations and low-level saliency in agnosia than in controls. These findings are discussed in relation to saliency-map models and the balance between high and low-level factors in eye guidance. (C) 2009 Elsevier Ltd. All rights reserved.