Magnetic responses of human visual cortex to illusory contours
- 作者：Ohtani ; Yoshio ; Okamura ; Shoichi ; Shibasaki ; Toshiyuki ; Arakawa ; Akira ; Yoshida ; Yoshikazu ; et. al.
- 关键词：Illusory contours ; Magnetoencephalography ; Human brain ; Visual cortex ; Striate cortex/extrastriate visual cortex ; Vision
- 刊名：Neuroscience Letters
- 出版年：2001
- 期刊代码：52_03043940
- 类别：neu
- 出版时间：March 22, 2001
- 卷：321
- 期：3
- 页码：173-176
- 文件大小：172 K
摘要
To examine the neural mechanism underlying illusory-contour perception, we measured the magnetic responses of the human visual cortex to an abutting-line grating inducing illusory contours (test stimulus) and a non-abutting-line grating (control stimulus) using the technique of magnetoencephalography (MEG). In the initial latency period of 60–80 ms, the MEG response to the test stimulus was nearly identical with that to the control stimulus, but in the subsequent period of 80–150 ms, the former was larger than the latter. The origin of the peak MEG response to the test stimulus was estimated to be in the vicinity of striate cortex/extrastriate visual cortex for two of the four subjects. These results suggest that, in accord with those of the previous electrophysiological and functional magnetic resonance imaging studies, illusory-contour signals are generated in the very early stage(s) of processing in the primate visual cortex.