Abstract: For measurement and display of auditory evoked potentials of the brain, pickup electrodes (A, Ref), an amplifier circuit (1 . . . 5) and an evaluation facility (7) are used to display the time trend of midlatency auditory evoked potentials (MLAEP) and simultaneously therewith, during measurement of the information signals, the time trend of early brain stem auditory evoked potentials (BAEP), which is displayed at a higher time resolution as compared to the information curve. For this purpose an amplifier circuit is used the isolation stage (8) of which is arranged in a way so that the total gain of the amplifier unit (1, 3) connected between electrode assembly (A, Ref) and isolation stage (8) amounts to between approximately 1000 and 4000.

Abstract: The invention relates to an arrangement and method for diagnosing malignant tissue by fluorescence observation with an endoscope. A stroboscope is used as a white light source in order to illuminate the interesting tissue region through the endosocope. A laser is simultaneously used in order to stimulate the fluorescence. At a time, the analyzer is activated in the dark phase between two light flashes of the stroboscope and deactivated during a visible light flash. The tissue, with a continuous fluorescence stimulation by exposure to light with a stimulating wavelength, may be observed under a pseudo-white light. The spectrogram may be represented on a screen which displays a normal white light endoscopic picture.