During the birth of Ammu he lost his hearing ability on one side but did not realize it.
Domestic breeds are often used to guard property due to their increased hearing ability.
A person is considered to be deaf if they cannot hear the same range of sounds as a person with normal hearing ability.
Clapping of the hands was a popular method in those days to test a child's hearing ability.
In fact, it was estimated by doctors that 70% of his hearing ability was missing.
One-third of the trial participants found that the system improved their hearing ability by more than 30%.
This is often beneficial for the hearing ability of the child.
Hunter did not know if Ishihara's hearing ability was fully equal to his own.
Others had a slight hearing ability, and could also speak.
They also may be confused about their child's hearing abilities.