How do your ears distinguish what you want to hear when a lot of sounds come into your ears?

On the one hand, we have two ears, and both the left and right ears are directionally selective (the principle is similar to phased array radar, which uses multiple small TR units to receive the signal, rather than using only one larger receiving unit like traditional radar), and we can use the correlation enhancement signal of binaural signals When we face the sound source, the perception of the target sound in a noisy environment will be significantly enhanced In layman's terms, hearing a certain sound requires the cognitive functions of the auditory system and the brain. The auditory system is mainly the material basis of afferent nerves and ears, and cognition is the processing function of the brain, and cognition can direct attention to strengthen the sensation of some sounds and weaken others from the multiplicity of sounds received. <>

The human ear is an important part of the auditory system, and it is the main organ for humans to hear sound. Here's the general process by which a human ear hears a sound:

1.Sound in the ear: When sound travels through the air to the human ear, it vibrates the pinna, causing fluctuations in the air inside the cochlea.

2.Vibration conduction: The vibrations travel through the bones and cartilage in the cochlea to the middle ear.

3.Vibrations are transmitted to the inner ear: When vibrations are transmitted to the inner ear, they trigger a series of physiological responses, such as impinging on the vestibular membrane and ossicular bones.

4.Bioelectric signaling: The inner ear's responses are converted into bioelectric signals, which are transmitted to the brain as nerve fibers conduct.

5.The brain recognizes sounds: When the brain receives these bioelectrical signals, it recognizes the sounds and converts them into the sounds we hear.

In short, the function of the human ear is accomplished by a series of complex physiological processes that allow us to hear the sounds around us.

The process of hearing sound in the ear is to first collect sound from the pinna, which is a physical sound wave, which is collected through the pinna and conducts vibrations through the ear canal to vibrate the tympanic membrane. Behind the eardrum are 3 ossicles, the smallest 3 bones in the human body, and this process is the conduction process. Auricular collection is transmitted through the external auditory canal to the tympanic membrane, which can be amplified by the tympanic membrane and ossicles.

Through sound wave vibration, mechanical energy is transmitted through the tympanic membrane and ossicles to the cochlear window of the stapes floor plate, and the fluid in the inner ear fills the cavity and drives the fluid activity of the inner ear when the stapes move. There are many hair cells in the inner ear structure, and as the fluid fluctuates, the hair cells will swing, and then the mechanical energy will be converted into bioelectricity, which will be transmitted to the center through the cochlear nerve, and the center will give feedback, which is the process of sound conduction.

The human ear is made up of three parts: the outer ear, the middle ear, and the inner ear. The human ear has the function of producing the sense of hearing and balance. The normal human ear can distinguish about 400,000 different sounds, some of which are so small that they can only move the eardrum to one-tenth the diameter of a hydrogen molecule.

When a sound is emitted, the surrounding air molecules start a series of vibrations, which are called sound waves, which propagate outward from the sound source. When sound reaches the outer ear, it is transmitted to the ear canal and to the eardrum through the concentrating action of the pinna. The eardrum is the dividing line between the outer and middle ears and is as thin as paper, but very strong.

When sound waves hit the eardrum, it causes the eardrum to vibrate. Behind the eardrum in the middle ear cavity, three interconnected ossicles are immediately followed. Each ossicle is the size of a grain of rice and is the smallest bone in the human body.

Their name is derived from their shape. Next to the tympanic membrane is the mallet (like an iron mallet), followed by the anvil (like an anvil), and finally the stapes (like a stirrup). When the sound waves vibrate the eardrum, the ossicles vibrate as well.

The 3 ossicles actually form a lever system that amplifies sound and transmits it into the inner ear. The last of the three ossicles is connected to a tiny membrane called the oval window. The oval window is the gateway to the inner ear, which contains the cochlea, the organ that specializes in hearing.

When the stapes vibrate, the oval window vibrates with it. On the other side of the oval window are cochlear ducts filled with fluid. When the oval window is vibrate, the liquid also starts to flow.

The cochlea is home to thousands of hair cells, which are topped with tiny cilia. As the fluid flows, the cilia of these cells are impacted, and after a series of bioelectric changes, the hair cells convert sound signals into bioelectric signals that are transmitted to the brain through the auditory nerve. The brain then processes and integrates the information delivered to produce hearing.

In addition, the inner ear contains a very important organ – the semicircular canals. The semicircular canal is composed of three small rings perpendicular to each other, which are responsible for the balance of the three-dimensional space of the head. When there is a problem with the semicircular canals, symptoms of vertigo may occur.

Hearing is a necessary communication channel for human social life. However, the most important thing is that hearing allows us to perceive our environment and create a sense of security and participation. Hearing is important for health.

Sound is an invisible sound wave formed by the pressure of air at different heights, and it can be perceived by the human ear. It seems like a simple ear, but it is actually a big family. Exposed, what we usually call the ear is called the pinna, and it is an open door.

Sound waves enter the ear canal from the pinna and vibrate the eardrum. The eardrum is a small, tight skin that sound waves cause it to vibrate. The eardrum is connected to a small bone called the malleus, and the vibration waves are transmitted from the malleus to two other small bones, the incus and the stapes, and then to the cochlea.

The cochlea is a snail-shell-like tube filled with fluid. As a result, the fluid of the cochlea fluctuates and pushes the cilia that protrude from the rows of hair cells in the fluid, which are normally only visible under a microscope. Ciliary movement generates nerve signals that are transmitted to the brain through a structure similar to a thread – nerves in the human body.

In this way, we heard.

Sound waves are transmitted to the eardrum through the external auditory canal, causing the eardrum to vibrate, and the vibration of the eardrum is transmitted to the cochlea through the ossicles, and the auditory nerve connected to the cochlea reports the sound signal to the brain, and we hear the sound.

How do ears hear bai? du

Hello, I heard the sound of the outside world, and the transmission of qi and bone conduction.

1.Air conduction. Exclusive propagation: Acoustic waves--- auricle -- external auditory canal -- tympanic membrane -- malleus - incus -- stapes--- vestibular window -- internal and external lymph --- spiral apparatus --- auditory nerve -- auditory center.

2.Bone conduction propagation: sound waves - skull vibrations--- internal and external lymphatic fluid--- spiral apparatus--- auditory nerve --- auditory center.

Sound comes from the external auditory canal, causing the eardrum to vibrate, driving the movement of the ossicular chain, causing lymphatic fluid circulation in the ear, causing the auditory hair cells in the cochlea to do cutting movements, converting sound signals into electrical signals, and finally hearing sound.

There is a layer of eardrum in the ear, and just like the principle of drumming, all sounds cause air to occur.

Vibration, this internal vibration is transmitted to the eardrum in the ear, causing the eardrum to vibrate, and then transmitted to three very small bones, these three small bones are then transmitted to many small cells similar to ear hair that connect to the nerves, these ear hair cells are so many as soon as they are born, as we use the ear, the destruction of noise, will gradually decrease, so when people are older, they will have hard of hearing, and the nerves will be transmitted to the brain.

The ear is exposed to the pinna, sound enters the ear canal from the pinna, causing the eardrum to vibrate, and the eardrum and a chain of ossicles vibrate into the cochlea to push the hair cells to produce sound, which is transmitted to the brain by the auditory nerve. We'll hear it.

There is a layer of white eardrum in the ear, similar to the principle of playing the drum, all the zhi sound will make the air vibrate, this vibration is transmitted to the ear in the ear, causing the eardrum to vibrate, and then transmitted to three very small bones, these three small bones are then transmitted to many small cells similar to ear hair that connect nerves, these ear hair cells are born so much, as we use the ear, the destruction of noise, will slowly become less, so people are older, there will be hard of hearing, The nerves are then transmitted to the brain.

In order to explain the reason for hearing sounds, the ear is medically divided into three parts: the outer ear, the middle ear, and the inner ear.

If you look closely at the shape of the ear pinna, there is a hole called the external auditory canal, and if you look inside, you will see a curved "tube" about 2 cm long, and the front is blocked by a membranous tissue. This passage is called the "outer ear". The pinna collects the sound and sends it through this small hole.

There are many glands on this external auditory canal that secrete some oil, plus metabolic shedding** and fine hairs form earwax, which is medically called "cerurum". If there is too much of this thing, it will block the transmission of sound. The ** of the external ear canal can also be infected with boils like the ** of other parts of the body, because the subcutaneous tissue is very dense and very painful.

From that membrane onwards, we can't see it. In fact, it looks like a matchbox placed vertically. There are three bones in it that are smaller than a grain of rice, the small bones.

This membrane is like the drum surface we are beating, so it is called the eardrum, and a little sound can be amplified on it. The three ossicles inside are connected into a chain-like structure, like a lever, and the sound is magnified many times more subtly. The structure of this segment is called the "middle ear".

The function of the middle ear is to amplify sound, that is, to convert sound energy into mechanical energy. For example, a decibel sound that reaches the end of the ossicle is 27 decibels. If there is fluid in this small space, which affects the vibration of the eardrum and the activity of the ossicles, then the sound cannot be effectively transmitted and amplified, and the sound will be small.

For example, secretory otitis media, purulent otitis media or something growing in it will reduce the conduction amplification of sound, which is "conductive deafness".