Temporal structure of implicit motor imagery in visual hand‐shape discrimination as revealed by MEG
作者:
Hiroaki Kawamichi,
Yoshiaki Kikuchi,
Hiroshi Endo,
Tsunehiro Takeda,
Shuji Yoshizawa,
期刊:
NeuroReport
(OVID Available online 1998)
卷期:
Volume 9,
issue 6
页码: 1127-1132
ISSN:0959-4965
年代: 1998
出版商: OVID
关键词: Inferior parietal area;Magnetoencephalography;Mental rotation;Motor imagery;Premotor area;Visuomotor integration
数据来源: OVID
摘要:
WE investigated the spatio-temporal brain activity on the time scale of several milliseconds related to the mental rotation task requiring judgements of hand orientation, using a whole-cortex MEG (magnetoencephalography) system. Neuronal activity in the visual cortex was observed ∼100–200 ms from stimulus onset, and that in inferior parietal lobe followed (after 200 ms). Both of these activities showed a contralateral dominance to visual stimulus hemifield. Premotor activity started later than the inferior parietal lobe activity, and these activities partially overlapped. Activity in primary motor and/or motosensory areas was observed in some subjects. The whole-cortex neuromagnetic measurements provided the time course of activity in the human brain associated with the implicit motor imagery: visual cortex ← inferior parietal lobe ↔ premotor cortex. This process is considered to be the transformation process of retinotopic locations into a body-centered reference frame necessary for the mental rotation task.
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