ISSN 1671-3710
CN 11-4766/R
主办：中国科学院心理研究所
出版：科学出版社

心理科学进展 ›› 2011, Vol. 19 ›› Issue (2): 159-165.

• 研究简报 • 上一篇    下一篇

基于fMRI的自上而下字母加工神经机制的研究

刘建刚;田捷;Kang Lee   

  1. (1北京交通大学计算机与信息技术学院, 北京 100044)
    (2中国科学院自动化研究所, 北京 100190) (3加拿大多伦多大学, 加拿大)
  • 收稿日期:2011-01-04 修回日期:1900-01-01 出版日期:2011-02-15 发布日期:2011-02-15

The Study of Neural Mechanism of Top-down Letter Processing Based on fMRI

LIU Jian-Gang;TIAN Jie;Kang LEE   

  1. (1 School of Computer and Information Technology, Beijing Jiaotong University, Beijing 100044, China)
    (2 Institute of Automation, Chinese Academy of Sciences, Beijing, 100190, China)
    (3 University of Toronto, Canada)
  • Received:2011-01-04 Revised:1900-01-01 Online:2011-02-15 Published:2011-02-15

PDF (PC)

2398

被引次数

3

摘要： 人们在识别自己所熟悉的物体时, 不仅依赖于对输入信息的感知而且还会受到自上而下调节机制的影响。研究者基于功能磁共振成像(fMRI), 利用虚幻探测范式对自上而下字母加工的神经网络进行研究。该研究要求被试从纯噪声(实际没有任何字母)中探测字母。通过对fMRI数据进行心理生理交互效应分析, 发现当被试从纯噪声图片中“看”到字母时, 多个脑区的活动由于受到来自于右侧梭状回的影响而加强。该发现表明自上而下的字母加工网络不但包含负责字母形状和语音加工的脑区, 还涉及一些负责高级认知加工的区域。

关键词: 字母加工, 自上而下, 功能磁共振, 心理生理交互效应

Abstract: People can efficiently recognize an object even under some extremely poor viewing conditions. Such efficient visual processing depends on both bottom-up input and top-down regulations. The present study used a novel illusory detection paradigm to investigate the neural network involved in top-down letter processing. This paradigm required participants to detect letters in pure noise images that actually contained no letters. By using of psychophysiological interaction (PPI) analysis, it revealed that some regions’ responses were influenced by the enhanced connectivity from the right fusiform. These findings suggested that the top-down letter processing network not only contains the regions that process the visual appearance of letters and their phonological information, but also involves neural regions involved in such high-level cognitive processes as memory retrieval and attention.

Key words: letter processing, top-down, fMRI, psychophysiological interaction