Temporal structure of implicit motor imagery in visual hand-shape discrimination as revealed by MEG.

Abstract:

: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 approximately 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.

journal_name

Neuroreport

journal_title

Neuroreport

authors

Kawamichi H,Kikuchi Y,Endo H,Takeda T,Yoshizawa S

doi

10.1097/00001756-199804200-00031

subject

Has Abstract

pub_date

1998-04-20 00:00:00

pages

1127-32

issue

6

eissn

0959-4965

issn

1473-558X

journal_volume

9

pub_type

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