Have you ever wondered how sound waves and sound frequencies are translated into identifiable sounds? How we hear is a multi-step process involving the outer ear, middle ear, inner ear, and brain.

Although complex, sound is processed in milliseconds. If your hearing has declined, identifying which step is not functioning properly guides your treatment options. 

How We Hear: Explanation in 4 Steps

Understanding how hearing works is key to understanding hearing loss. Here is a quick overview of auditory processing and the answer to the question of “how do we hear”. 

Step 1: Outer Ear Sound Processing

The external portion of your ear is the pinna or auricle. The funnel-like shape of the pinna is the first step of the hearing process. Sound waves are filtered, amplified, and carried along the ear canal to the eardrum. Sound waves vibrate through the thin membrane of the eardrum in a manner similar to what happens when you beat a drum. 

Step 2: Middle Ear Sound Processing

The 3 smallest bones in your body are located within your ear, and they play a vital role in how the ear works. These are the malleus, the incus, and the stapes. The size, shape, and placement of the malleus, incus, and stapes amplify and move sound waves through the eardrum to the middle ear. The stapes is connected to a second membrane, the tympanic membrane. 

Step 3: Cochlear Sound Processing 

The ear contains an organ you may not have heard of before, the Corti. The Corti is in the inner ear, where the cochlea resides. The cochlea is lined with tiny sensory hair cells that are activated by different sound frequencies. As the stapes vibrates, it places pressure on the tympanic membrane. This pressure creates waves in the fluid-filled cochlea. This pressure translates vibrations into electrical impulses. 

Step 4: Processing Sound in the Brain

Your brain translates vibration into speech, music, and the sounds of everyday life. The electrical impulses created in the Corti run along an intricate network of nerves to the brain. These auditory pathways in the thalamus, temporal lobe, and auditory cortex process different types of sounds.  

How the auditory process works in the brain:

• Translating Sound: The brain is responsible for turning noise into identifiable sound. In a split second, you can determine if you are listening to a person, music, background noise, pet, and all sounds you are familiar with.  
• Distance and Location: Your brain helps you know where to look when you hear a sound in the distance. For example, if a book falls off a shelf in another room, you may not know what fell until you see it, but you know what direction the sound came from. 
• Sound Filtering: Your brain filters background noise so you can focus on conversation or what you are currently listening to. It also shuts down some pathways to allow for sleep. For example, you may wake up in the middle of the night to a loud sound or an unfamiliar sound, but your brain filters everyday sounds, such as your pet moving around the bed, your partner getting in or out of bed, or your creaking ceiling.  

How Sound Frequencies Are Lost

When sensory hair cells are damaged or destroyed it disrupts your hearing. Unlike other hair cells in the body, these sensory cells do not repair or regrow. You will naturally lose some of your 16,000 sensory hair cells with age, but loud noises can prematurely damage or destroy them. This is why you experience short-term noise-induced hearing loss after going to a loud concert. 

A concert, club, and other loud noises overstimulate your hair cells. After a period of rest, typically a few hours to a couple of days, hearing is restored. However, the damage is permanent. 

Types of Hearing Loss

• Conductive Hearing Loss: This occurs when hearing does not transmit from the outer or middle ear. If the cause is earwax, ear infection, or swimmer’s ear, hearing is typically easy to restore. Otherwise, the damage may be permanent. 
• Sensorineural Hearing Loss: This is the permanent damage or destruction of sensorineural hair cells in the inner ear, caused by loud noises or a combination of loud noise and aging. Different hair follicles translate different sounds, resulting in high frequency hearing loss or low frequency hearing loss. 
• Mixed Hearing Loss: This refers to a combination of both conductive and sensorineural hearing loss. 
• Auditory Disorder: An auditory processing disorder refers to a range of diagnoses that involve the auditory nerves and the brain. The outer, middle, and inner ear process sound, but sound is not properly transmitted from the nerves to the brain. 

Now That You Understand How Hearing Works, Schedule Your Hearing Evaluation

Hearing is the second most important of our 5 senses. It keeps us safe, connected, and engaged. That said, you can live a high quality of life with declining hearing and full hearing loss. Treatment options have never been more advanced, including both hearing aids and technologies that translate speech in real-time. 

If you live in or around Holmdel, New Jersey or Staten Island, New York, and you have noticed a change in your hearing, schedule a diagnostic hearing evaluation with Dr. Zhanneta Shapiro. Even if your hearing loss is permanent, early detection can slow its progression.

Frequently Asked Questions About How We Hear

1. How long does it take for the brain to process sound?

Sound is processed in just milliseconds. As soon as sound waves enter your ear, they’re converted into electrical impulses that travel to your brain through the auditory nerve. Your brain instantly interprets these signals as recognizable sounds—like a voice, a song, or background noise—allowing you to react in real time.

2. What causes hearing loss as we age?

Age-related hearing loss, or presbycusis, is one of the most common types of hearing decline. It occurs when the tiny sensory hair cells inside the cochlea are gradually damaged over time. This damage can result from years of noise exposure, genetics, or certain medical conditions. Regular hearing evaluations in Holmdel, NJ, or Staten Island, NY, can help catch changes early and preserve your hearing health.

3. Can hearing loss be reversed or cured?

The answer depends on the cause. Conductive hearing loss, such as that caused by earwax buildup or a middle ear infection, can often be treated and reversed. However, sensorineural hearing loss—caused by damage to the inner ear’s hair cells—is usually permanent. Fortunately, patients in the Holmdel and Staten Island areas have access to advanced treatment options like digital hearing aids and real-time speech translation devices that make hearing clearer and more natural.

4. What is the best way to prevent hearing loss?

Protecting your ears from loud noise is key. Always wear ear protection at concerts, sporting events, or construction sites, and keep your headphone volume at safe levels. In addition, adopting healthy lifestyle habits—such as managing blood pressure and avoiding smoking—can help preserve your hearing. Dr. Zhanneta Shapiro offers proactive hearing loss prevention and screening services locally in Holmdel, NJ, and Staten Island, NY.

5. When should I schedule a hearing test?

If you often ask others to repeat themselves, turn up the TV volume, or struggle to follow conversations in noisy environments, it’s time for a hearing test. Most adults should have a comprehensive hearing evaluation every 3 to 5 years, or sooner if exposed to frequent loud sounds. If you live in or near Holmdel, New Jersey, or Staten Island, New York, you can schedule your diagnostic hearing evaluation with Dr. Zhanneta Shapiro for accurate testing and personalized care.