KMID : 0860920100120010014
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Journal of the Korean Association EMG-Electrodiagnostic Medicine 2010 Volume.12 No. 1 p.14 ~ p.18
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The Motor Cortex Mapping Using Transcranial Magnetic Stimulation by Large and Angled Figure of Eight Coil in Normal Subjects
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Kim Han-Seon
Son Su-Min Chang Min-Cheol Ahn Sang-Ho Cho Yun-Woo Cho Hee-Kyung Jang Sung-Ho
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Abstract
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Objective: To investigate the characteristics of the motor cortex mapping using large and angled figure of eight stimulator in normal subjects.
Methods: Twenty-four subjects without history of neurological diseases were recruited. The motor cortex mapping for abductor pollicis brevis muscle was performed with large(diameter: 80 mm) and angled(120¡Æ) figure of eight stimulator.
Results: The optimum stimulation point were found at coordination(5.83, 0.67), (-5.50, 0.54). Excitation threshold was 75.83% of the maximum stimulus for right motor cortex and 76.25% for the left. Average latency was 20.36 msec for the right and 20.35 msec for the left, and average amplitude was 367 ¥ìV for the right and 451 ¥ìV for the left, respectively. Ipsilateral motor evoked potential was not found in any subjects.
Conclusion: We conclude that transcranial magnetic stimulation using this large and angled figure of eight coil is useful for motor cortex mapping.
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KEYWORD
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Figure of eight coil, Motor cortex, Brain mapping, Motor evoked potential, Magnetic stimulation
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