The brain centre for hearing stores sounds and noises for up to three years following the onset of a hearing loss. But after about seven years the memory becomes weaker and weaker. Therefore, it is important to have your hearing tested and hearing aids fitted when you find that you are losing some of your hearing. Once you have a hearing aid the hearing processing resumes supplying signals to the brain.
If the fitting of a hearing aid is seriously delayed, however, not even a hearing aid will be able to transform the incoming sound signals into understandable information. This means that the brain no longer recognizes ordinary everyday sounds and noises, such as the hum of the refrigerator or the computer. The brain must learn to hear all over again. If you have any doubts about your hearing, you should see your doctor and have a hearing test.