Auditory Threshold Location and Uncertainty as a Function of Tone Parameters and Fatigue

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Abstract
The relationship of auditory threshold location for various pulsed and continuous tones was investigated, using a Bekesy audiometer. For periods from 250-750 msec., an increase in repetition rate results in a decrease in threshold, independent of the duty cycle. This relationship was maintained after a temporary threshold shift of 20 dB. The pen-excursion size, in this case, was found to be a function of the pulse length, with longer pulses giving the greatest reduction in pen-excursion size. Continuous tones yield the highest thresholds and the greatest reduction in pen-excursion size under normal conditions after temporary threshold shift. The differences in threshold location are thought to be owing to an increase in the ability to make tone present-absent decisions during interruptions, while the decreases in pen-excursion size may be owing to the perception of the increased rate of loudness growth.

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