Our ability to hear begins at around 18 weeks of development in the womb
Our perception of sound comes from two handy organs sitting neatly on either side of our heads. As sound waves move into the ear canal and arrive at the eardrum, they vibrate it. The eardrum is a thin membrane that carries these vibrations around three tiny bones known as the middle ear before they are amplified by a snail-shaped structure called the cochlea. Fluid within the cochlea ripples with every vibration, triggering hair-like cells within that detect the different pitches in the vibrations and generate an electrical signal along the neighbouring auditory nerve. The auditory nerve delivers the signal to the brain, where it is interpreted as sound along with its many aspects, such as its volume, pitch and tone. A typical human ear can hear sound waves in the frequency range of 20 to 20,000 hertz, but the physiology of the human auditory system means we are unable to perceive sounds outside of this range.
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