Why are two hearing aids better than one?
In truth, we don't really hear in our ears. Actually, we "hear" in our brains. Our brain processes the electrical signal sent to it by the ears. Hearing with two ears is called binaural hearing. Sound localization is very dependent on input from both of our ears. For example, when we hear something in the distance, such as a friend calling our name, the input the brain receives tells us from which direction our friend's voice is coming. The ability to tell the direction from which the sound is coming is called localization.
Research has shown that people who wear two hearing aids (binaural amplification) instead of one understand speech and conversations much better. Binaural amplification will deliver more of the sounds you need. Then, your brain can process the sounds correctly.
There is a phenomenon called adult late onset auditory deprivation, which is when word recognition ability decreases as a result of lack of stimulation to the auditory processing centers of the brain. Approximately 80 percent of people who suffer from hearing loss have it in both ears. Amplifying only one ear when both ears have hearing loss can put you at a disadvantage. Binaural hearing aid wearers have reported that listening and participating in conversations is more pleasant with two hearing aids.