Riemslag F C, Beers A P, Spekreijse H
Academic Medical Centre, Department of Ophthalmology, Amsterdam, The Netherlands.
Doc Ophthalmol. 1992;80(1):75-82. doi: 10.1007/BF00161233.
The Laplacian operator in electroencephalographic measurements consists of a mathematical combination of the responses from a number of electrodes (e.g., five in a crosswise montage). It enhances activity from sources lying underneath the area covered, relative to activity from outside this area. Thus, by appropriate positioning, the contributions of extrastriate and striate sources can be recorded selectively. To quantify the contribution of each hemisphere to half-field onset evoked potentials, the responses in two Laplacian operators, one over each hemisphere, were analyzed and compared to monopolar derivations and a bipolar derivation between the two hemispheres. Both the Laplacian and bipolar analyses were helpful in interpretation of the responses.
脑电图测量中的拉普拉斯算子由多个电极（例如，十字形组合中的五个电极）的响应进行数学组合而成。相对于该区域外部的活动，它增强了覆盖区域下方源的活动。因此，通过适当的定位，可以选择性地记录纹外和纹状源的贡献。为了量化每个半球对半场起始诱发电位的贡献，分析了两个拉普拉斯算子（每个半球一个）中的响应，并将其与单极导联以及两个半球之间的双极导联进行比较。拉普拉斯分析和双极分析都有助于对响应进行解释。
