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首页> 美国卫生研究院文献>Human Brain Mapping >Functional magnetic resonance imaging of neural activity related to orthographic phonological and lexico‐semantic judgments of visually presented characters and words
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Functional magnetic resonance imaging of neural activity related to orthographic phonological and lexico‐semantic judgments of visually presented characters and words

机译：神经活动的功能磁共振成像涉及视觉呈现的字符和单词的字形语音和词汇语义判断

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Functional magnetic resonance imaging was used to investigate neural activity during the judgment of visual stimuli in two groups of experiments using seven and five normal subjects. The subjects were given tasks designed differentially to involve orthographic (more generally, visual form), phonological, and lexico‐semantic processes. These tasks included the judgments of whether a line was horizontal, whether a pseudocharacter or pseudocharacter string included a horizontal line, whether a Japanese katakana (phonogram) character or character string included a certain vowel, or whether a character string was meaningful (noun or verb) or meaningless. Neural activity related to the visual form process was commonly observed during judgments of both single real‐characters and single pseudocharacters in lateral extrastriate visual cortex, the posterior ventral or medial occipito‐temporal area, and the posterior inferior temporal area of both hemispheres. In contrast, left‐lateralized activation was observed in the latter two areas during judgments of real‐ and pseudo‐character strings. These results show that there is no katakana “word form center” whose activity is specific to real words. Activation related to the phonological process was observed, in Broca's area, the insula, the supramarginal gyrus, and the posterior superior temporal area, with greater activation in the left hemisphere. These activation foci for visual form and phonological processes of katakana also were reported for the English alphabet in previous studies. The present activation showed no additional areas for contrasts of noun judgment with other conditions and was similar between noun and verb judgment tasks, suggesting two possibilities: no strong semantic activation was produced, or the semantic process shared activation foci with the phonological process. Hum. Brain Mapping 8:44–59, 1999. © 1999 Wiley‐Liss, Inc.
机译：在七个和五个正常受试者的两组实验中，功能磁共振成像用于研究视觉刺激判断过程中的神经活动。给受试者分配的任务被不同地设计，包括正字法（通常是视觉形式），语音学和词汇语义学过程。这些任务包括判断行是否为水平线，伪字符或伪字符字符串是否包含水平线，日语片假名（语音图）字符或字符串是否包含某个元音，或字符串是否有意义（名词或动词） ）或毫无意义。在判断外侧外侧纹状皮层，后腹侧或枕骨颞内侧区域以及两个半球后下颞侧区域的单个实字符和单个假字符时，通常会观察到与视觉形态过程相关的神经活动。相反，在判断实字符和假字符字符串时，在后两个区域中观察到了左侧激活。这些结果表明，没有片假名“单词形式中心”的活动专门针对真实单词。在布罗卡区，岛状，上颌上回和后颞上区观察到与语音过程相关的激活，在左半球有更大的激活。片假名的视觉形式和语音过程的这些激活焦点在先前的研究中也被报道为英语字母。当前的激活没有显示出其他与名词判断和其他条件形成对比的区域，并且在名词和动词判断任务之间也很相似，表明了两种可能性：没有产生强烈的语义激活，或者语义过程与语音过程共享了激活焦点。哼。 Brain Mapping 8：44–59，1999.©1999 Wiley-Liss，Inc.

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