Cortical Audiometry in Normal Hearing Subjects

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Abstract
Our present investigation deals with the influence of three stimulus parameters an slow evoked potentials derived from the intact scalp after acoustic stimulation (sine tones of 60 σ duration) in normal hearing subjects. Random application of the stimulus (50 times, every 1 to 3”) is more efficient than a periodical stimulation (60 times, one stimulus every second). When stimulus intensity increases, the intensity of the reaction—mainly N1-P2—also increases, and the latency—mainly N1 and P2—decreases, provided that the 40 dB stimulation intensity is not exceeded. The lower frequencies (250, 500, 1000, and 2000 c/s) give rise to a much clearer cortical reaction than the higher frequencies (4000 and 8000 c/s).