Issn Print: 1531-7129

Publication Date: 2002/01/01


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Magnetoencephalography Related with Voluntary Facial Movement During the Task of Lip Protrusion

Kazutaka Higashino; Takanobu Kunihiro; Hisao Ohde; Yasuhiro Haruta; Jin Kanzaki

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Excerpt

Magnetoencephalography (MEG) is a useful and non-invasive method of brain mapping that has been used in many studies on evoked fields. However, there have been very few reports on magnetoencephalographic fields related with motor function. This is the first report of the recordings of magneticoencephalographic fields related with voluntary facial movement.
We succeeded in recording magnetoencephalographic fields just before and during the task of lip protrusion by using a 160-channel whole-head type biomagnetometer. The normal human subject repeated this task 200 times in an interval of approximately 5 seconds. In all of the 3 patients examined, equivalent current dipoles were identified initially in the nearby left primary motor area from approximately 300 ms before the initiation of the task (-300 ms). At the time of -200 ms, equivalent current dipoles (ECDs) were clearly identified in the primary motor cortex bilaterally.
These results indicate that the neural activity in the primary motor cortex for lip protrusion starts not symmetrically, but asymmetrically, first in the left hemisphere and then in the right hemisphere.

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