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|DOES EVERYONE NEED TWO HEARING AIDS?||
Localization - knowing where the sound came from - is only possible with two ears, and just about impossible with one ear. Localization is not just a sound quality issue; it may also be a safety issue. Think about how important it is to know where warning and safety sounds (sirens, screams, babies crying, etc.) are coming from.
Enhanced discrimination in noise. Research shows that using both ears together tends to impact how well we hear in noisy environments. Binaural hearing permits you to more effectively, attend to the desired signal while squelching or paying less attention to undesired sounds such as background noise. The squelcing effect is "central" (i.e., affected by the brain) most likely in the area of the reticular formation in the cerebellum. This is similar to binocular vision.
Reference: The Contribution of Brainstem and Cerebellar Pathways to Auditory Recognition, McLachlan, N. & Wilson, S. Published online 2017 Mar 20. doi: 10.3389/fpsyg.2017.00265