Abstract
This study reports on the perceived position of the tonal signal during a threshold tracking procedure. The stimulus was a 1000 Hz sinusoid tone. The inter-stimulus (ISI) interval varied from 2 ms to 64 ms. The noise stimulus was a 70 dB HL band-limited white noise. The subject tracked threshold (2 dB steps). In these experiments, ten normal hearing subjects (18–30 years) were presented the stimulus before the noise burst. Moving through a critical ISI value, the stimulus becomes inaudible after a further reduction in ISI, the stimulus is detected but appears to follow the noise. This finding supports a hypothesis that the tonal signal may be modulated by physiological loci by changing the ISI and the tonal intensity.
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