Magnetic brain activity elicited by visually presented symbols and Japanese characters
Magnetic brain activity elicited by visually presented symbols and Japanese characters
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DOI：
10.1097/00001756-200404090-00006
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发表时间：
2004-04
期刊：
影响因子：
1.7
通讯作者：
Y. Shirahama;K. Ohta;A. Takashima;E. Matsushima;Y. Okubo
中科院分区：
文献类型：
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作者：
Y. Shirahama;K. Ohta;A. Takashima;E. Matsushima;Y. Okubo
文字阅读的标准模型假定后下颞叶皮层参与书写文字的处理。这种处理可能发生在刺激呈现后的200 ms内。为了更准确地描述这一过程，我们进行了MEG研究期间的阅读任务，在9个右利手正常日本受试者。受试者被要求对一个与人体有关的词做出反应，这样所有的刺激都会受到相同的语义处理。非目标条件下的试验，如汉字词，有意义的假名词，假名假词和符号进行了分析，以避免可能的P300效应。符号的磁响应峰值约为200 ms，小于其他三个字母条件中的任何一个。这一结果可能表明，M200反映了特定的词的过程，如视觉词的形式识别。
A standard model of word reading postulates that the posterior inferior temporal cortex is involved in the processing of written words. This processing probably occurs within 200 ms after stimulus presentation. In order to characterize this process more precisely, we conducted a MEG study during a reading task in nine right-handed normal Japanese subjects. The subjects were required to respond to a word pertaining to the human body so that all stimuli would be subject to the same semantic processing. The trials for non-target conditions, such as kanji words, meaningful kana words, kana pseudowords and symbols were analysed to avoid possible P300 effect. The magnetic response peak of around 200 ms for symbols was smaller than any of the other three letter conditions. This result may suggest that M200 reflects the word-specific process such as visual word form recognition.