What Is Air Conduction?

A method of transmitting sound waves to the inner ear: Sound waves directly through the cranial pathway cause corresponding fluctuations in the external lymphatics and excite the cochlea's spiral organs to produce hearing. Bone conduction refers to the orientation of osteoblast precursor cells from the surface of the host bone and bone marrow around the implant bed through proliferation and extension into the surface of the implanted bone and its cavity, generating osteoblasts to form new bone.

A method of transmitting sound waves to the inner ear: Sound waves directly through the cranial pathway cause corresponding fluctuations in the external lymphatics and excite the cochlea's spiral organs to produce hearing. Bone conduction refers to the orientation of osteoblast precursor cells from the surface of the host bone and bone marrow around the implant bed through proliferation and extension into the surface of the implanted bone and its cavity, generating osteoblasts to form new bone.

Chinese name

Bone conduction

Foreign name

Bone conduction

Concept

Auditory conduction through bones

Typical case

Musician Beethoven learns piano with teeth stick

Conduction

There are two types of bone conduction: mobile and squeeze

Conduction characteristics

Relatively small attenuation and change of energy and tone

Animal illustration

Snake hears sound through bone conduction

Bone conduction I. Overview:

This is actually because of skull sound!

This is because the transmission channels of sound waves are different. The external sound heard by the human ear is the vibration of the external air through the eardrum to transmit the sound information to the auditory nerve, plus the processing of the brain, it forms the hearing we say. The sound we hear when we speak by ourselves is directly transmitted from the inside of the vocal cords to the auditory nerve by the skull, plus another hearing process formed by the brain.

In other words, the former allows others to hear the sound through the air; the latter spreads through the skull to allow the self to hear the sound.

Why is there such a big difference between the two modes of transmission? In fact, this is because the sound transmitted through the air is affected by the environment, and its energy will be greatly attenuated, which will cause a great change in tone color, and when the sound reaches the inner ear of other people, it will also pass through the outer ear, eardrum, and middle ear. This process is also Will affect the energy and sound effects of the sound. The sound transmitted through the skull bone directly reaches the inner ear through the bones between the throat and the ear. The attenuation and change of sound energy and timbre are naturally relatively small. Therefore, the resulting hearing is different.

In normal auditory function, the acoustic energy introduced into the cochlea by bone conduction is very small, which has no practical significance.

Bone conduction II, the principle of bone conduction

It all starts with how we hear the sound. Under normal circumstances, sound waves enter the inner ear through two paths of air conduction and bone conduction, and then the inner and outer lymph fluid of the inner ear vibrates. The spiral organ completes the sensory process, and then the auditory nerve produces nerve impulses, which are presented to the auditory center, the brain After a comprehensive analysis of the cortex, the sound was eventually "heard". Perhaps for air conduction (the path is sound wave-auricle-external ear canal-tympanum-malleolus-anvil-sacrum-vestibular window-external, internal lymph-spiral-auditory nerve-auditory center), we have more or less Perceptual knowledge, but a little confused about bone conduction. Maybe you can understand it with an example: cover your ears with both hands and talk to yourself, no matter how small the sound, we can hear what we say, this is the result of bone conduction.

Bone conduction

There are two types of bone conduction: mobile and squeeze. The two can stimulate the spiral organ to cause hearing. The specific conduction pathway is: "Sound wave-skull-bone labyrinth-inner ear lymph fluid-spiral organ-auditory nerve-cerebral cortex auditory center. ". Usually people don't need to use their skull to feel the sound, but when the sound wave transmission is blocked by the lesions of the outer ear and middle ear, bone conduction can be used to make up for hearing. Such as bone-conduction hearing aids, bone-conduction headphones, etc., use bone conduction to feel the sound.

For example, plug your ears with two cotton balls. Take a tuning fork and hit it multiple times with a rubber hammer to make the tuning fork vibrate, but its vibration sound is very light, and your ears cannot hear it. Holding the ends of the tuning fork handle against your frontal bone, cranium, and sacrum, respectively, will allow you to clearly hear the vibration of the tuning fork. Once the tuning fork handle is out of contact, the sound disappears immediately.