Ozaki I, Yaegashi Y, Kimura T, Baba M, Matsunaga M, Hashimoto I
Department of Physical Therapy, Faculty of Health Science, Aomori University of Health and Welfare, 58-1 Mase, Hamadate, Aomori 030-8505, Japan.
Neurosci Lett. 2001 Sep 7;310(1):41-4. doi: 10.1016/s0304-3940(01)02090-0.
The dipole orientation of equivalent current source for the high frequency oscillations (HFOs) above 300 Hz and that for the underlying N20m were compared. Somatic magnetic fields were recorded over the left hand somatosensory area to right median nerve stimulation at the wrist with a wide-bandpass (0.1-2000 Hz). The HFOs and underlying N20m were extracted by digital filtering of 300-900 Hz and 1-300 Hz, respectively. We found that the orientation of the HFOs and underlying N20m current sources differs and that the HFO source orientation shows a more divergent pattern than the N20m. These results suggest that the somatosensory HFOs are not generated from the pyramidal cell population in area 3b which produces the underlying N20m and that they may reflect activities of the non-pyramidal neuron population.
比较了300Hz以上高频振荡（HFOs）和其下的N20m等效电流源的偶极子方向。在手腕处对右侧正中神经进行刺激，通过宽带通（0.1 - 2000Hz）在左手体感区记录躯体磁场。分别通过300 - 900Hz和1 - 300Hz的数字滤波提取HFOs和其下的N20m。我们发现HFOs和其下N20m电流源的方向不同，并且HFO源方向比N20m显示出更分散的模式。这些结果表明，体感HFOs并非由产生其下N20m的3b区锥体细胞群产生，它们可能反映了非锥体细胞群的活动。
