EFFECT OF FREQUENCY ON AUDITORY EVOKED RESPONSE

This study investigated the effects of frequency on the amplitude of the cortical evoked response as recorded from the cranial vertex. The stimuli were monaurally presented tones, 200 msec in duration, with frequencies of 500, 1000, 2000, or 4000 Hz. Stimulus intensities of 90-dB hearing level (HL) and 45-dB hearing level (HL) were examined. A negative relationship was found between the amplitude of the evoked response and the frequency of the stimulus. At both intensity levels, the amplitude of the response decreased progressively as the frequency increased. © 1969, Psychonomic Journals, Inc.. All rights reserved.