Random dots blinkinga new approach to elucidate the activities of the extrastriate cortex in humans
作者:
Tomohiro Okusa,
Yoshiki Kaneoke,
Sachiko Koyama,
Ryusuke Kakigi,
期刊:
NeuroReport
(OVID Available online 1998)
卷期:
Volume 9,
issue 17
页码: 3961-3965
ISSN:0959-4965
年代: 1998
出版商: OVID
关键词: Character;Extrastriate cortex;Fusiform gyrus;Magnetoencephalography;MEG;Random dots;Recognition;Visual cortex
数据来源: OVID
摘要:
TO investigate cortical activities related to the visual recognition of characters, we recorded the magneto-encephalography (MEG) in six normal subjects who were encouraged to discriminate capital English letters displayed for a brief period. To reduce the primary responses evoked by the luminance change in the striate cortex (V1), we used a novel stimulus method, random dots blinking (RDB), by means of the temporal changes of patterns using a large number of small random dots. Along with the MEG recording, we also measured the discrimination accuracy rate (%) to know how well the subjects recognized the letters. One clear component, about 30 0 ms in peak latency, was identified in all six subjects. Its peak amplitude and the discrimination accuracy rate increased similarly as the character display duration became longer. Its signal source was estimated in the extrastriate cortex, around the fusiform gyrus, in the right hemisphere. We suspect that the activity in these cortical areas has strong relation to the conscious perception of characters.
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