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Analysis of intelligent visual processes by behavioral observation and MEG measurement

通过行为观察和脑磁图测量分析智能视觉过程

基本信息

批准号：
08458280
负责人：
KURIKI Shinya
金额：
$ 2.94万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08458280/
关键词：
Magnetoencephalography Reaction time Kana characters Comparison task Phonological process Words 図形的処理

项目摘要

The objective of this research project is to delineate the intelligent visual processes to perceive and recognize Japanese characters and symbols, based on the behavioral observation and the measurement of brain activity. For the bbehavioral observation, we used a cognition task of visual forms, where the reaction time and the percent correct performance were measured. As the brain activity, we measured MEG responses while subjects performed the task. The main results are summarizedbelow :1. The RT measured in two cognition tasks of single Kanacharacters to detect vowels and morphological features was not signijicantly different each other. However, the focal neural activities, as located from the MEG analysis, at 150-300 ms after the character onset differed in a manner that the left ventraloccipitotemporal region is selectively active across subjects in the vowel detection, but the areas from the ventralto parietaloccipital region were active in the morphology detection. These results suggest that the cortical neural activity in the visual extrastriate areas would be modidied, through topdown mechanisms, depending on the individual strategy to recognize written characters, i.e., more generally written sentences.2. The RT measured ia a categorization task of threecharacter words and that in a vowel detection task of single characters was not different. However, RT was significantly shorter in a morphology detection task of symbols, which indicates the easiness of this tadk. Neural activites for these stimuli and tasks were commonly observed at 150-300 ms in the medialoccipital to ventraloccipital areas. In addition to these, the left occipitotemporal activity was selectively observed in the word task, but not character and symbol tasks. Taking into consideration of previous studies on various visual form processing, it is suggesed that the left ventraloccipitotemporal area subserves specific visual word processing and/or general processing of complex visual forms.

该研究项目的目标是根据行为观察和大脑活动测量来描述感知和识别日本字符和符号的智能视觉过程。对于行为观察，我们使用了视觉形式的认知任务，其中测量了反应时间和正确表现的百分比。作为大脑活动，我们测量了受试者执行任务时的脑磁图反应。主要结果总结如下： 1．在单个假名字符的两项认知任务中检测元音和形态特征时测量的 RT 彼此没有显着差异。然而，从 MEG 分析中定位，在字符出现后 150-300 毫秒时，局灶性神经活动有所不同，即在元音检测中，左侧腹枕颞区在各个受试者中选择性活跃，但在形态检测中，腹侧至顶枕区的区域则活跃。这些结果表明，视觉外纹区域的皮质神经活动将通过自上而下的机制进行修改，具体取决于识别书面字符（即更普遍的书面句子）的个体策略。 2． RT 在三字符词的分类任务中测量，并且在单个字符的元音检测任务中没有什么不同。然而，在符号的形态检测任务中，RT 明显更短，这表明该 tadk 的简单性。这些刺激和任务的神经活动通常在 150-300 毫秒时观察到内侧枕叶至腹枕叶区域。除此之外，在单词任务中选择性地观察到左侧枕颞叶活动，但在字符和符号任务中则没有。考虑到以前对各种视觉形式处理的研究，建议左腹枕颞区有助于特定的视觉文字处理和/或复杂视觉形式的一般处理。