ELECTROENCEPHALOGRAPHY
Abstract
W. T. LIBERSON, M.D., PH.D.,NORTHAMPTON, MASS.Three meetings highlighted the past year: the International Congress of Electroencephalography, the International Physiological Congress, and the meeting of the International League Against Epilepsy. In view of these outstanding events, only published papers presented at these meetings will be reviewed.TECHNIQUES AND PROCEDURES(is).in theAn amplifier in which EEG signals modulate considerably higher frequency and actuate the recording pen after rectification was presented(42)-advantages: the recording of DC potentials and the avoidance of artifacts resulting from stimulation. Modification of the conventional analyzer write-out trace(2I), new flexible cortical electrodes (5o), and a moving-picture camera simultaneously photographing EEG tracings(64) were described. Artificially induced fever (57), novocainization of the carotid sinus(59), pentylenetrazol(66), and bulbocapnine(5) were suggested for activation of EEG abnormalities. Topically applied acethylcholine may reveal cortical epileptogenic foci ( i6, 6o). The usefulness of metrazol activation was reaffirmed, among ânormalâ subjects, individuals with suggestive neurological history show a higher percentage of induced paroxysms than does the total population. Photic activation is less effective( 12). Photicmetrazol activation was helpful in military practice (43).BASIC DIRECT CURRENTS RESEARCHThe following studies of the applied steady potentials upon neuronic tissue stress the significance of the above-mentioned findings. Unit activities of the cerebellar cortex