A DRY ELECTRODE FOR EEG RECORDING
A DRY ELECTRODE FOR EEG RECORDING
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DOI：
10.1016/0013-4694(94)90053-1
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发表时间：
1994-05-01
期刊：
影响因子：
--
通讯作者：
SMITH, RL
中科院分区：
文献类型：
--
作者：
TAHERI, BA;KNIGHT, RT;SMITH, RL
本文介绍了一种用于脑电信号记录的干面电极样机的设计、制作和测试。这种新型干式电极的优点是不需要皮肤准备或导电膏，降低了对运动伪影的敏感度，并提高了信噪比。该电极的传感元件是一个3 mm的不锈钢圆盘，其一侧沉积了一层2000埃A(200 Nm)厚的氮化物涂层。盘的背面连接到阻抗转换放大器。将原型电极安装在铜板上，用尼龙搭扣将其固定在头皮上，并在脑电记录的3个方面，即(1)自发脑电、(2)感觉诱发电位和(3)认知诱发电位，比较了该原型干电极和市售湿电极的性能。除了原始脑电，还记录了来自两种电极的信号的功率谱。结果表明，在所有类型的脑电信号分析中，干式电极的性能与常规电极相当。在需要大量电极或延长记录时间的情况下，这种新电极可用于制作高分辨率的大脑活动表面图。
This paper describes the design, fabrication and testing of a prototype dry surface electrode for EEG signal recording. The new dry electrode has the advantages of no need for skin preparation or conductive paste, potential for reduced sensitivity to motion artifacts and an enhanced signal-to-noise ratio. The electrode's sensing element is a 3 mm stainless steel disk which has a 2000 Angstrom A (200 nm) thick nitride coating deposited onto one side. The back side of the disk is attached to an impedance converting amplifier. The prototype electrode was mounted on a copper plate attached to the scalp by a Velcro strap.The performance of this prototype dry electrode was compared to commercially available wet electrodes in 3 areas of electroencephalogram (EEG) recording: (1) spontaneous EEG, (2) sensory evoked potentials, and (3) cognitive evoked potentials. In addition to the raw EEG, the power spectra of the signals from both types of electrodes were also recorded. The results suggest that the dry electrode performs comparably to conventional electrodes for all types of EEG signal analysis. This new electrode may be useful for the production of high resolution surface maps of brain activity where a large number of electrodes or prolonged recording times are required.