The effects of subthreshold 1 Hz repetitive TMS on cortico-cortical and interhemispheric coherence

被引:93
作者
Strens, LHA
Oliviero, A
Bloem, BR
Gerschlager, W
Rothwell, JC
Brown, P
机构
[1] Inst Neurol, Sobell Dept Neurophysiol, London WC1N 3BG, England
[2] Catholic Univ Rome, Neurol Inst, Rome, Italy
[3] Univ Med Ctr St Radboud, Dept Neurol, NL-6500 HB Nijmegen, Netherlands
[4] Univ Vienna, Dept Neurol, A-1090 Vienna, Austria
关键词
cortico-cortical coherence; electroencephalogram; motor cortex; transcranial magnetic stimulation;
D O I
10.1016/S1388-2457(02)00151-7
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
Objectives: Repetitive transcranial magnetic stimulation (rTMS) shows promise as a treatment for various movement and psychiatric disorders. Just how rTMS may have persistent effects on cortical function remains unclear. We hypothesised that it may act by modulating cortico-cortical and interhemispheric connectivity. To this end we assessed cortico-cortical and interhemispheric coherence before and after low frequency, subthreshold rTMS of the left motor cortex. Methods: Fifteen healthy subjects received one train (1 Hz, 90% of active motor threshold, 1500 stimuli) of rTMS to the left motor hand area. Spectral power and coherence estimates were calculated between different electroencephalogram (EEG) signals at rest and while muscles of the distal upper limb were tonically contracted. Results: rTMS over the left motor hand area caused a significant increase in ipsilateral EEG-EEG coherence and in the interhemispheric coherence between motor areas in the alpha band. The effects of rTMS lasted up to 25 min post-stimulation. There was no significant change in EEG-EEG coherence over the hemisphere contralateral to stimulation. Conclusions: Low frequency, subthreshold rTMS of the motor cortex increases ipsilateral cortico-cortical and interhemispheric coherence in the alpha band. This may, in part. mediate the inhibitory effects of low frequency rTMS. (C) 2002 Elsevier Science Ireland Ltd. All rights reserved.
引用
收藏
页码:1279 / 1285
页数:7
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