Electroencephalograms have long been an important tool for measuring and diagnosis in neurophysiological research and practice, but there is still much debate about how those tiny electrical impulses are generated in the brain, and how they get to sensors on the skull. The 18 papers, selected and updated from presentations at a symposium in Hamburg, September 1990, report the latest experimental and clinical findings, and various interpretations of them. Annotation copyright Book News, Inc. Portland, Or.