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首页> 美国卫生研究院文献>Cerebral Cortex (New York NY) >The Role of Left Occipitotemporal Cortex in Reading: Reconciling Stimulus Task and Lexicality Effects
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The Role of Left Occipitotemporal Cortex in Reading: Reconciling Stimulus Task and Lexicality Effects

机译：左枕颞皮层在阅读中的作用：调和刺激任务和词汇效应

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摘要

Although the left posterior occipitotemporal sulcus (pOTS) has been called a visual word form area, debate persists over the selectivity of this region for reading relative to general nonorthographic visual object processing. We used high-resolution functional magnetic resonance imaging to study left pOTS responses to combinatorial orthographic and object shape information. Participants performed naming and visual discrimination tasks designed to encourage or suppress phonological encoding. During the naming task, all participants showed subregions within left pOTS that were more sensitive to combinatorial orthographic information than to object information. This difference disappeared, however, when phonological processing demands were removed. Responses were stronger to pseudowords than to words, but this effect also disappeared when phonological processing demands were removed. Subregions within the left pOTS are preferentially activated when visual input must be mapped to a phonological representation (i.e., a name) and particularly when component parts of the visual input must be mapped to corresponding phonological elements (consonant or vowel phonemes). Results indicate a specialized role for subregions within the left pOTS in the isomorphic mapping of familiar combinatorial visual patterns to phonological forms. This process distinguishes reading from picture naming and accounts for a wide range of previously reported stimulus and task effects in left pOTS.
机译：尽管左后枕颞沟（pOTS）被称为视觉单词形式区域，但相对于一般的非正交视觉对象处理，该区域对于阅读的选择性仍存在争议。我们使用高分辨率功能磁共振成像来研究左pOTS对组合正字法和物体形状信息的响应。参与者执行了旨在鼓励或抑制语音编码的命名和视觉辨别任务。在命名任务期间，所有参与者都显示左pOTS内的子区域对组合拼字法信息比对对象信息更敏感。但是，当消除语音处理要求后，这种差异就消失了。对伪单词的响应比对单词的响应要强，但是当删除语音处理要求时，这种效果也消失了。当必须将视觉输入映射到语音表示形式（即名称）时，特别是在必须将视觉输入的组成部分映射到相应的语音元素（辅音或元音音素）时，优先激活左侧pOTS内的子区域。结果表明，在熟悉的组合视觉模式到语音形式的同构映射中，左侧pOTS内的子区域具有特殊作用。该过程将阅读与图片命名区分开来，并解释了以前报告的左侧pOTS中的多种刺激和任务效果。

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