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Volley theory
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<p>Volley theory states that groups of <a href="/facts/Neurons/G7CyTVdH">neurons</a> of the <a href="/facts/Auditory_system/fJYTKjje">auditory system</a> respond to a sound by firing <a href="/facts/Action_potentials/Sz8yCRqx">action potentials</a> slightly out of phase with one another so that when combined, a greater frequency of sound can be encoded and sent to the brain to be analyzed. The theory was proposed by Ernest Wever and Charles Bray in 1930 as a supplement to the <a href="/facts/Temporal_theory_(hearing)/4PWDHMdk">frequency theory</a> of hearing. It was later discovered that this only occurs in response to sounds ranging from about 500 Hz to 5000 Hz. </p>