Visual complexity in letter-by-letter reading: "Pure" alexia is not pure
Visual complexity in letter-by-letter reading: "Pure" alexia is not pure
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DOI：
10.1016/s0028-3932(98)00005-0
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发表时间：
1998-11-01
期刊：
影响因子：
2.6
通讯作者：
Sekuler, EB
中科院分区：
文献类型：
--
作者：
Behrmann, M;Nelson, J;Sekuler, EB
对纯粹失读症的标准解释倾向于这样一种观点，即这种后天性阅读障碍是由于专门处理字母数字符号的左后枕叶皮质机制受损所致。我们在两个实验中对这些说法提出质疑，并证明有这种阅读缺陷的患者在物体识别方面也受到损害。在第一个实验中，我们表明，一个单一的主题，EL，谁显示的所有标志性特征的纯失读症，是受损的图片识别在一个大的刺激。随着图片视觉复杂性的增加，EL识别刺激的反应时间相对于控制对象不成比例地增加。在第二个实验中，我们证实了这些发现与一个更大的五个纯失读症患者使用选定的子集的高和低视觉复杂性的图片。这些研究结果表明，引起纯粹失读症的缺陷不仅限于正字法符号培色，而是一个更通用的视觉处理机制受损的后果。(C)1998爱思唯尔科技有限公司版权所有。
Standard accounts of pure alexia have favoured the view that this acquired disorder of reading arises from damage to a left posterior occipital cortex mechanism dedicated to the processing of alphanumeric symbols. We challenge these accounts in two experiments and demonstrate that patients with this reading deficit are also impaired at object identification. In the first experiment, we show that a single subject, EL, who shows all the hallmark features of pure alexia, is impaired at picture identification across a large set of stimuli. As the visual complexity of pictures increases, so EL's reaction time to identify the stimuli increases disproportionately relative to the control subjects. In the second experiment, we confirm these findings with a larger group of five pure alexic patients using a selected subset of high- and low-visual complexity pictures. These findings suggest that the deficit giving rise to pure alexia is not restricted to orthographic symbols pei se but, rather, is a consequence of damage to a more general-purpose visual processing mechanism. (C) 1998 Elsevier Science Ltd. All rights reserved.