周波数の異なる親指刺激による体性感覚誘発磁界応答の検討 : 生体磁気

概要

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We measured somatosensory evoked fields (SEFs) by electric stimulation to the right thumbs of five subjects, using a three dimensional, second-order gradiometer connected to 39-channel SQUIDs, which can simultaneously detect the magnetic field components perpendicular to the scalp (Br) and tangential to the scalp (B_θ, B_φ). To assess the relationship between phase lag and stimulation repetition frequency (SRF), we detected the delay time of a component synchronous with stimulation interval (27 to 1007 ms) by convolution of the reference signal and SEF wave. Phase lag was linear to SRF for at least two different SRFs in both Br and B_θ. It was calculated by the test for significance of the linear regression slope (β≠0. P<0.05). Response latencies calculated from the slope were ranged from 200.9 ± 16.2 ms to 46.4 ± 2.2 ms in Brand from 189.3 ± 34.3 ms to 45.5 ± 5.2 ms in B_θ. We also analyzed the power spectrum of SEF waves by time-frequency analysis.
2002-04-01