Basic study on the relationship between subjective perception of vibration and actual body vibrations induced by low-frequency noise

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We measured the threshold levels for experiencing "vibration perceived in the head," which was originally defined in this study, and the equal-sensation levels for "vibration perceived in the head" at eight frequencies (16, 20, 25, 31.5, 40, 50, 63, and 80 Hz). The reference tones used for measuring the equal-sensation levels were 50-Hz, 80-dB(Z) and 50-Hz, 85-dB(Z) tones. While measuring the threshold levels and the equal-sensation levels, actual head vibrations of the subject were also measured at three locations on the head. The levels of the actual head vibrations were found to be not high, suggesting that the actual head vibrations induced by low- or moderate-level low-frequency noise hardly contributed to the perception of vibration in the head.