title: [Development of electroencephalography for the localization of invasive lesions].
abstract: Hjorth described a special multielectrode derived from a theory of Laplace. This type of derivation will accentuate the contribution of the potential field under the active electrode relative to the surrounding electrical activity and is therefore called "source derivation". Preliminary clinical studies seem to confirm the supposition that source derivations tend to focus activity from individual electrodes in a better way than standard derivations do. Technical changes in a 16-channel EEG are the reason for simultaneously EEG-recording to test the method of the standard derivation (uni- and bipolar) against the source derivation. Total of 4280 EEGs have been recorded concerning the generalisation of activity, focal activity by epilepsia, cerebro-vascular disease and tumors of the brain. In most of the recordings focal activity was more sharply pronounced in source than in conventional derivations with problematical reference points.
mesh_terms: D001924:Brain Concussion / Q000175:diagnosis; D001927:Brain Diseases / Q000175:diagnosis*; D002545:Brain Ischemia / Q000175:diagnosis; D001932:Brain Neoplasms / Q000175:diagnosis; D004569:Electroencephalography; D004827:Epilepsy / Q000175:diagnosis; D006801:Humans; D008297:Male; D008875:Middle Aged
vernacular_title: Die Entwicklung der Elektroenzephalographie zur Lokalisation von raumfordernden Prozessen.