Temporal Integration at thresholds at very low and infrasonic frequencies
Résumé
The human ear can perceive sound well below 20 Hz, i.e. infrasound, provided that the levels involved are high enough to be heard. It is also known that below a critical duration, the shorter the sounds are, the higher their intensity must be to be detected. Furthermore, this duration seems to increase with decreasing frequency. While most studies about hearing at infrasonic frequencies mention the necessity to use stimuli of sufficient length to be above the critical duration, to our knowledge only one study has actually measured the critical duration for a couple frequencies below 20 Hz and showed that at 4 Hz, the critical duration would be above 4000 ms. The presented work aims at bringing more precision to the measurement of the critical duration. In this paper, we will present the experimental setup built in order to reproduce infrasound at audible levels and the test procedure that we will use to measure the critical duration at different durations and frequencies below 63 Hz.
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Elsawaf et al - Temporal Integration at thresholds at very low and infrasonic frequencies.pdf (585.35 Ko)
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