We report on the measurement of somatosensory-evoked and spontaneous magnetoencephalography (MEG) signals with a chip-scale atomic magnetometer (CSAM) based on optical spectroscopy of alkali atoms. The uncooled, fiber-coupled CSAM has a sensitive volume of 0.77 mm3 inside a sensor head of volume 1 cm3 and enabled convenient handling, similar to an electroencephalography (EEG) electrode. When positioned over O1 of a healthy human subject, α-oscillations were observed in the component of the magnetic field perpendicular to the scalp surface. Furthermore, by stimulation at the right wrist of the subject, somatosensory-evoked fields were measured with the sensors placed over C3. Higher noise levels of the CSAM were partly compensated by higher signal amplitudes due to the shorter distance between CSAM and scalp.
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机译：我们报告了基于碱性原子光谱的芯片规模原子磁力计（CSAM）对体感诱发和自发性脑磁图（MEG）信号的测量。未冷却的，纤维耦合的CSAM的传感器头内部的敏感体积为0.77 mm 3 ，体积为1 cm 3 ，并且类似于脑电图（EEG）一样易于操作电极。当放置在健康人的O1上方时，在垂直于头皮表面的磁场分量中会观察到α振荡。此外，通过在对象的右手腕处进行刺激，使用放置在C3上方的传感器来测量体感诱发场。由于CSAM和头皮之间的距离较短，因此较高的信号幅度可以部分补偿较高的CSAM噪声水平。
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