Vasomotor response to pure tones using photoplethysmography

Digital photoplethysmography has been applied to the determination of hearing levels for pure tones. On average, the levels established were some 30 dB higher than those obtained with conventional pure-tone audiometry. Intervals between stimuli, however, were shown to have a significant effect upon the responses and the evidence suggests that recovery periods of 5 min may be required to obtain stable responses. The resulting testing tone involved is probably too long for most practical purposes.