Third auditory pathway “cartilage conduction”
Third auditory pathway different from air and bone conduction
[Reference] https://en.wikipedia.org/wiki/Cartilage_conduction
Since the 15th century, more than 500 years ago, two pathways through which sound can be heard have been known: air conduction, where vibrations in the air are heard, and bone conduction, where sound is transmitted through the bones. Many devices utilizing these pathways have been released. On the other hand, in 2004, Professor Hiroshi Hosoi from the Department of Otorhinolaryngology at Nara Medical University discovered that when vibrations containing audio information are applied to the ear cartilage, the audio information is transmitted to the inner ear with clarity comparable to air conduction and bone conduction. He named this discovery "Nankotsu Dendou" in Japanese and "Cartilage Conduction" in English. "Cartilage Conduction" is often misunderstood as a type of "bone conduction," but its hearing mechanism, sound transmission properties, and characteristics are entirely different from those of "bone conduction." These facts have been demonstrated in auditory experiments and published in many scientific papers. For more details, please refer to the published papers. Bone conduction sound is heard when the sound (vibration) energy is transmitted to the inner ear through the skull, bypassing the eardrum and middle ear. In contrast, cartilage conduction is a phenomenon where sound (vibration) energy vibrates the ear canal cartilage forming the outer half of the cylindrical ear canal, generating air conduction sound (air pressure waves) within the ear canal. This air conduction sound then reaches the inner ear via the eardrum and middle ear, producing a natural sound that utilizes the important auditory functions of the eardrum and middle ear that humans inherently possess. Therefore, unlike bone conduction, it achieves a complete stereo sensation. This difference can be easily experienced by listening, distinguishing it from both air conduction and bone conduction sounds.
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Contribution to society through cartilage conduction system
Breakdown of Japan's 14 Million People with Hearing Loss and Society's Responsibility
Many people who have hearing loss but do not use hearing aids are elderly people with mild to moderate hearing loss who “think” they can hear.
However, since they are not really hearing perfectly, they are missing out on hearing at the counter and other places, causing problems in their work and social lives.
Solving this problem would be of great benefit not only to the individual but also to society as a whole.
If institutions with window services can understand this, it will lead to the realization of a society in which the elderly can thrive and play an active role.
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