The speech banana is a area in which all the speech sounds of the language fall on an audiogram. An audiogram is a graphical representation of a person's hearing sensitivity at a range of frequencies and loudness levels, and it is generally presented with frequencies (in Hertz on the x-axis and decibel level (dB) on the y-axis. When the sounds of speech or phonemes of all known human languages are plotted on an audiogram, they cluster in a banana-shaped region known as the speech banana.
People with normal hearing sensitivity can also hear sounds outside of the speech banana. These sounds include ambient natural sounds such as a rustling of leaves in the wind or birds chirping. Artificial sounds outside of the speech banana can include music and mechanical noises (e.g., automobiles, lawn mowers).
Audiologists are primarily concerned with hearing loss that occurs within the speech banana because it can slow the development of a child’s language and speech abilities, and this in turn can profoundly interfere with learning. Hearing loss within the speech banana can also hinder communication capabilities in adults, as in elderly people with age-related hearing loss.
Benefit of the hearing aid also showed with the help of speech banana. If all the aided (speech and tone) fall with the banana then we consider as significant benefit from the device. If not child or adults will be evaluated for other hearing devices options like, Cochlear implant.