![]() ![]() And hair cells are found allĪlong the basilar membrane, so this membrane right here This would be the base of the cochlea, and this would be the This would be the base of the cochlea, I'll use a darker color. ![]() So let's look at another picture, just to make things a little bit clearer. Very apex of the cochlea are stimulated by very Very high frequency sounds, and hair cells at the ![]() Now if we unrolled it, and looked at which hairĬells were activated, given different sounds, we would notice that hairĬells at the very base of the cochlea were actually activated by So the base would be right here, the apex would be right here. So this would be the very base, this is the base of the cochlea, and this is the very apex, the very tip. And if we were to unroll this cochlea, if we took the cochlea and we unrolled it, so it's normally rolled up like this, if we unrolled it, so now it's flat, there are varying hair cells. There's actually a membrane that contains a bunch of hair cells. So this is a huge range,Īnd in order to distinguish between sounds of lowĪnd high frequencies, the brain uses the cochlea, and particularly, something known as "Basilar Tuning." And the term "basilar" comes from the basilar membrane, which is inside the cochlea. So this is known as "Auditory Processing." Your brain needs to be able to distinguish between sounds of varying frequencies, and you're actually able to hear things with a frequency of 20 hertz, all the way up to aįrequency of 20,000 hertz. In order for the brain to be able to perceive different sounds. How the cochlea distinguishes between sounds of varying frequencies, and how this distinction is maintained all the way to the brain, Sound wave is converted into a neural impulse by the cochlea, that eventually reaches the brain. And we went into a lot of detail about how exactly the So as the informationįrom a base drum beating, or a bee's wings flapping, comes into the ear, they eventually hit the cochlea. The air very quickly, have a very high frequency. So a base drum has a very low frequency, whereas the wings of a bee, when they're moving through So, the difference between a base drum and a bee's wings flapping in the air, is the frequency. Voiceover: In order to distinguish between the sounds of a base drum and something that hasĪ much higher frequency, such as the sound of a bee's wings flapping in the air, your brain is relying on the cochlea, in order to differentiate between the two different sounds. ![]()
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