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hearing. the sense by which sounds are perceived, by conversion of sound waves into nerves impulses, which are then interpreted by the brain. Also, the capacity to perceive sound. The organ of hearing is the ear, which is divided into three sections, the outer, middle and inner ear. Each plays a special role in hearing.
The commonly stated range of human hearing is 20 Hz to 20 kHz. Under ideal laboratory conditions, humans can hear sound as low as 12 Hz. Humans are most sensitive to (i.e. able to discern at lowest intensity) frequencies between 2,000 and 5,000 Hz.