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Can we experience complete silence? Probably not. The quieter it is, the harder to get rid of all sounds. In a soundproof room, you start to hear sounds of your own body: breathing, swallowing, or digestion. Even if you manage to block your ears completely, the auditory neurons still make spontaneous activities that the brain abandons because they are below the criteria for perception. These neural activities, if strong and cohesive, can activate the cochlea and a sound can emit from the ear. Called spontaneous otoacoustic emissions, these can be measured as high as 10 to 20 dBSPL from people with normal hearing.