How Hearing Works

How do we hear? Learn more about hearing, from how sound is received in our ears and how hearing works in the brain in our complete guide to explain how hearing works.

REQUEST AN APPOINTMENT

You might be wondering how we hear sounds. Hearing is the process of sound travelling through the outer, middle and inner ear to be interpreted by the brain. There are four main steps of hearing:

  1. Sound waves enter the ear canal and move towards the eardrum

  2. Vibrations caused by the sound waves striking the eardrum make three tiny bones located in the middle ear to vibrate

  3. Hair cells within the cochlea catch the vibrations and turn them into electrical signals

  4. The auditory nerve carries the electrical signals to the brain where it understands sound


The
 Hearing Process of the Human Ear

The ear can be divided into three main parts, each part playing an important role in transmitting sound. The three main parts of your ear are the outer, middle, and inner ear.

Your hearing depends on all three parts working together as a team and if you have a problem anywhere in the process, you may experience hearing loss.

 

Outer Ear

The outer ear consists of the auricle (pinna), ear canal, and eardrum. The pinna is the part of the ear that you see on the side of your head. Its main job is to collect sound waves, which are vibrations, and funnel them into your ear canal, where the sound is amplified. The glands in the skin lining the ear canal produce earwax which protects the canal by cleaning out dirt and helps prevent infects. The sound waves travel through the ear canal and strike the eardrum causing it to move or vibrate.

Middle Ear

The middle ear is separated from the outer ear by the eardrum, which is a thin piece of tissue that stretches across the ear canal. As sound waves strike the eardrum causing it to move, the movement leads to the vibration of very small bones called ossicles. The ossicles are:

  • The malleus, which is attached to the eardrum
  • The incus, which is attached to the malleus
  • The stapes, which is attached to the incus and it is the smallest bone in the body
Inner Ear

The vibrations of the ossicles creates movement of the fluid in the inner ear, or cochlea. The movement of the fluid causes the hair cells to move and sends an electrical nerve impulse from the inner ear to the auditory nerve and up to the brain.

 

The inner ear also contains the vestibular organ that is responsible for balance.

How the Ear Works
Hearing with Both Ears

Our ears work as a team to help improve our ability to locate sound and distribute volume. Being able to hear with both ears makes it easier to understand speech and tell where sounds are coming from. Some people may experience hearing loss in one ear, but not the other.

Cochlea

The cochlea is a part of the inner ear and it contains hair cells which convert the liquid motion into electrical nerve impulses that travel to the brain.

Cochlear Hair Cells
At birth, each ear normally has about 12,000 hair cells that sit on a membrane that vibrates in response to sound. Each hair cell sits on a different part of the membrane and therefore responds to different frequencies. The hair cells are responsible for converting the mechanical vibrations into electrical signals, which get passed onto the auditory nerve.
Auditory Nerve
The auditory nerve connects the cochlea to the auditory cortex in the brain. The electrical signals from the hair cells excite the nerve fibers which carry information about a different frequency to the brain. The information is analyzed by multiple brain centers as it flows to the auditory cortex.
Auditory cortex in the temporal lobe

The auditory cortex is the part of the brain responsible for perceiving sound and is found in the temporal lobe. It is integral for determining where in space a sound originates as well as identifying what might have produced the sound, recognizing aspects of sound that are specific to speech, and our perception of pitch.



How we hear is the sound waves enter the ear canal and move towards the eardrum which causes the eardrum to vibrate making three tiny bones located in the middle ear to move. The hair cells within the cochlea catch the vibrations and turn them into electrical signals that get carried to the auditory nerve in the brain where it understands sound. If there is a problem along the pathway it can cause you to have hearing loss.

 

If you think you or a loved one are showing signs of hearing loss, you can start by taking a free online hearing test. You just need an internet connection and a pair of headphones, and you can do it from the comfort of your own home. Our online hearing test takes a few minutes, and you can have the results emailed to you. It will tell you if you are showing signs of hearing loss.

You may also be interested in...

Request an appointment at the nearest HearCANADA location

When you fill out the form below, we will reach out to you as soon as possible to book your appointment. Wait times may vary.
*
*
*
*
*