Magnetoencephalography (MEG) is a noninvasive technique for investigating neuronal activity in the living human brain. The time resolution of the method is better than 1 ms and the spatial discrimination is, under favorable circumstances, 2-3 mm for sources in the cerebral cortex. Many interesting properties of the working human brain can be studied, including spontaneous activity and signal processing following external stimuli. A subscription to _Reviews of Modern Physics_ is required for access to the full text, but this study is comprehensive -- 93 pages in length. | 
