Basic study on the perceptual characteristics of vibratory sensation induced by complex low-frequency noise

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By using complex low-frequency noise, which were made of two pure tones within the 16-80 Hz range, as test stimuli, we measured the threshold levels and the equal-sensation levels for "vibration perceived in the head", and compared them to those levels for hearing sensation. The hearing sensation was found to be contributed dominantly by a tonal component at a higher frequency, while the perception of vibration in the head was found to be contributed by both tonal components. This result suggests that vibratory sensation is more easily induced by complex low-frequency noise containing plural frequency components whose sound pressure levels are close to the threshold levels for inducing vibratory sensation. It is reasonably deduced that the effect of vibratory sensation needs to be taken into account in assessing psychological effects of such complex low-frequency noise.