Abstract

Short duration auditory fatigue was tested after exposure for two seconds to white noise (level variable between 30 and 110 db re 0.0002 dyne/cm2). Following stimulation the change from a predetermined threshold of a probe tone was assayed. The free interval between stimulus and probe was adjustable between 0.025 and 7 seconds (10 steps within the first second, full second steps thereafter). The probe consisted either of a 0.04-second white-noise or pure-tone pip (500 to 8000 cycles in octave steps) or of a click. In addition to the absolute change in threshold at various intervals, the slope of return to the pre-exposure level was assessed; for the sake of simplicity the latter was expressed as the percentage difference in threshold change at two relatively distant points on the time axis. Tests were conducted on trained and untrained subjects with normal hearing for pure tones. Variation in and among subjects was evaluated in order to determine the applicability of the three different forms of probe as a routine test measure.

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