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.

该研究项目的目的是根据行为观察和大脑活动的测量来描述智能视觉过程，以感知和识别日本角色和符号。对于Bbehavioral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的性能百分比。作为大脑活动，我们在受试者执行任务时测量了MEG响应。主要结果是总结：1。在单个Kanacharacters检测元音和形态学特征的两项认知任务中测量的RT并没有明显地不同。然而，在特征发作后的150-300毫秒内，局灶性神经活动的差异是在元音检测中的左侧腹侧静脉内颞区有选择性的，但是vowel检测的区域有选择性地活跃在形态检测中活跃。这些结果表明，视觉外部区域中的皮质神经活动将通过上下机制进行调制，具体取决于识别书面字符的单个策略，即更一般的书面句子。2。 RT测量了三个单词的分类任务，在单个字符的元音检测任务中没有差异。但是，在符号的形态检测任务中，RT显着短，这表明该tadk的易感性。这些刺激和任务的神经活动通常在腹膜内侧至腹膜枕骨的150-300毫秒处观察到。除此之外，在单词任务中选择性地观察到了左枕颞活动，但不是字符和符号任务。考虑到先前关于各种视觉形式处理的研究，建议左侧腹侧静脉区域subserv subsert subsert subsert subsert subserve tem the Visual Word处理和/或复杂视觉形式的一般处理。