What is the main function of the cochlea?

What is the main function of the cochlea?

Excerpt. The cochlea is a hollow, spiral-shaped bone found in the inner ear that plays a key role in the sense of hearing and participates in the process of auditory transduction. Sound waves are transduced into electrical impulses that the brain can interpret as individual frequencies of sound.

How does the cochlea code for frequency and intensity?

We have seen that in the cochlear nerve, information about sound intensity is coded for in two ways: the firing rates of neurons and the number of neurons active. These two mechanisms of coding signal intensity are found throughout the auditory pathway and are believed to be the neural correlates of perceived loudness.

How do different frequencies affect the sound we hear?

The higher the frequency waves oscillate, the higher the pitch of the sound we hear. As you see, sound frequency is determined by the way in which sound waves oscillate whilst travelling to our ears, meaning that they alternate between compressing and stretching the medium, which in most cases is air.

Does cochlea amplify sound?

The cochlear amplifier is essentially a positive feedback loop within the cochlea that amplifies the traveling wave. Thus, vibrations within the organ of Corti are sensed and then force is generated in synchrony to increase the vibrations.

What happens when the vibrations are passed into the cochlea of the inner ear?

The outer most part receives the sound wave and passes it to the middle ear. The middle ear then passes the vibrations to the inner ear which is known as Cochlea. This part of the ear is very sensitive and converts the stimulus to the neural signal and passes it to the brain for further action.

What do different frequencies do?

Different frequencies of sound can have a different effect on human brain activity. It’s believed that once a new frequency gets introduced to your brain, your brain waves feel compelled to sync to it — effectively launching you into a different “brain state” and having an overall holistic effect on your body.

Why do higher frequencies sound louder?

The higher harmonics make the note sound louder partly because they add extra power to the sound wave, but also because our ears become more sensitive as the frequency increases with increasing frequency (at least up to about a kHz).

What is the frequency range of the cochlea?

The cochlea is capable of exceptional sound analysis, in terms of both frequency and intensity. The human cochlea allows the perception of sounds between 20 Hz and 20 000 Hz (nearly 10 octaves), with a resolution of 1/230 octave (from 3 Hz at 1000 Hz).

What is the cochlea capable of?

Facebook Twitter Google+. The cochlea is capable of exceptional sound analysis, in terms of both frequency and intensity. The human cochlea allows the perception of sounds between 20 Hz and 20 000 Hz (nearly 10 octaves), with a resolution of 1/230 octave (from 3 Hz at 1000 Hz).

How does the cochlea work at 1000 Hz?

At 1000 Hz, the cochlea encodes acoustic pressures between 0 dB SPL (2 x 10-5 Pa) and 120 dB SPL (20 Pa). When sound pressure is transmitted to the fluids of the inner ear by the stapes, the pressure wave deforms the basilar membrane in an area that is specific to the frequency of the vibration.

What happens when the cochlea is stimulated by sound waves?

Using cochleae taken from human cadavers and hydraulic models, he demonstrated that when the cochlea was stimulated by a sound wave, the basilar membrane motion was a wave that travelled from the base of the cochlea. The amplitude of this wave increased with distance travelled, arrived at a maximal point and then experienced a rapid drop off.