Saarland University, Clinical Neuropsychology Unit, Saarbruecken, Germany.
Neuropsychologia. 2010 Nov;48(13):3706-14. doi: 10.1016/j.neuropsychologia.2010.09.006. Epub 2010 Sep 15.
Patients with right hemisphere lesions often omit or misread words on the left side of a text or the beginning letters of single words which is termed neglect dyslexia (ND). Two types of reading errors are typically observed in ND: omissions and word-based reading errors. The prior are considered as space-based omission errors on the contralesional side of the page, while the latter can be viewed as a kind of stimulus- or word-based reading errors where leftsided parts of a single perceptual entity (the word) are neglected. The head, trunk and eyes are part of a hypothetical egocentric reference frame that is aligned around our body and divides space into a left and right hemispace. Previous neglect studies have shown that head- and trunk-orientation significantly influence contralesional neglect. An open question is whether such egocentric manipulations also influence omissions and word-based errors in paragraph reading in ND. The current study investigated in a sample of right-hemisphere lesioned patients with ND vs. without ND and matched healthy control subjects the influence of head-rotation (HR) on both types of reading errors using controlled indented paragraph reading tests. Passive leftward HR significantly reduced omission errors on the left side of the text in ND, but had no effect on word-based reading errors. In conclusion egocentric manipulations like HR only appear to influence space-based attentional processes in neglect evident as omissions in paragraph reading but have no impact on those attentional processes involved in word identification evident as word-based errors in paragraph reading.
右侧大脑损伤的患者经常会遗漏或读错文本左侧的单词或单词的起始字母，这被称为忽视性失读症（ND）。ND 通常会观察到两种类型的阅读错误：遗漏和基于单词的阅读错误。前者被认为是页面对侧的基于空间的遗漏错误，而后者可以看作是一种基于刺激或基于单词的阅读错误，其中单个感知实体（单词）的左侧部分被忽略。头、躯干和眼睛是假设的以自我为中心的参考框架的一部分，该框架围绕着我们的身体，并将空间分为左右半空间。以前的忽视研究表明，头和躯干的朝向显著影响对侧忽视。一个悬而未决的问题是，这种以自我为中心的操作是否也会影响 ND 患者段落阅读中的遗漏和基于单词的错误。本研究使用受控缩进段落阅读测试，在 ND 患者与无 ND 患者和匹配的健康对照组中，调查了头部旋转（HR）对这两种阅读错误的影响。被动的向左 HR 显著减少了 ND 患者文本左侧的遗漏错误，但对基于单词的阅读错误没有影响。总之，像 HR 这样的以自我为中心的操作似乎只影响忽视中基于空间的注意过程，表现为段落阅读中的遗漏，但对涉及单词识别的注意过程没有影响，表现为段落阅读中的基于单词的错误。
