JUN 16, 2017 5:05 PM PDT

What is sound?


So what is sound really? And how can just a mash up of vibrations create such lovely and horrible noises in our ears? To understand what sound is, we have to delve deep into physics, biology, and neuroscience. Let's first focus on the physics by imagining sound as it travels. Sound travels as vibrations emitted from a source; these vibrations look like waves because they make air molecules bump into each other, and the size and speed of the wave creates a different sound. For example, a long and slow wave generates a low sound (think foghorn), while a short and fast wave makes a high sound (tinkling bells).

But how do we hear sound? The vibrations from that foghorn or tinkling bell will first reach the folds of you ear, called your pinna, which catch the vibrations and channel them through your ear canal to your eardrum. And just as an actual drum produces sound through vibrations, when the waves in the air hit your eardrum, they make the surface of your eardrum membrane vibrate, which is turn move three tiny bones in your inner ear. These bones then pass the vibrations onto another membrane called the oval window, which leads to the cochlea, in which there is perilymphatic fluid that receive the vibrations. But it doesn't stop there. Deep in the cochlea is the organ of corti, on which there are neurons called hair cells, and these are what conveys the sound waves to your brain. From there, it's up to the primary auditory cortex and several other parts of your brain to recognize the sound in a way that make sense to you!
About the Author
  • Kathryn is a curious world-traveller interested in the intersection between nature, culture, history, and people. She has worked for environmental education non-profits and is a Spanish/English interpreter.
You May Also Like
JUL 27, 2020
Neuroscience
Bigger Brains Linked to More Manual Dexterity in Apes
JUL 27, 2020
Bigger Brains Linked to More Manual Dexterity in Apes
Although people are very skilled at using their hands, they take a long time to master how to use them. Meanwhile, for m ...
JUL 30, 2020
Space & Astronomy
Indian Schoolgirls Discover Asteroid Moving Towards Earth
JUL 30, 2020
Indian Schoolgirls Discover Asteroid Moving Towards Earth
During a project sponsored by Space India and NASA, two schoolgirls aged 14 in the 10th grade discovered an asteroid nea ...
SEP 11, 2020
Chemistry & Physics
The Rise of (Micro)Robots
SEP 11, 2020
The Rise of (Micro)Robots
As reflected by Moore's law, the semiconductor industry has observed a tremendous growth in microelectronics in the ...
SEP 18, 2020
Chemistry & Physics
Toward Understanding Anesthesia
SEP 18, 2020
Toward Understanding Anesthesia
General anesthesia refers to the medical procedure anesthesiologists applies to patients, in order to induce paraly ...
OCT 09, 2020
Space & Astronomy
Why the Sun's Atmosphere is Hotter than its Surface
OCT 09, 2020
Why the Sun's Atmosphere is Hotter than its Surface
Researchers have found evidence of nanojets (bright, thin lights) in the solar atmosphere, also known as the corona. The ...
OCT 24, 2020
Space & Astronomy
The Closest Black Hole to Earth Isn't a Black Hole After All
OCT 24, 2020
The Closest Black Hole to Earth Isn't a Black Hole After All
Earlier this year, astronomers reportedly identified the 'closest black hole to Earth every discovered'. However ...
Loading Comments...