CHAPTER TWO
REVIEW OF THE RELATED LITERATURE
Introduction
This chapter presents the review of past studies associated with exceptional children particularly the deaf.
The sub-topics are presented as follows:
- Definition of deaf
- Signs and types of deafness
- Causes of Deafness
- Problems associated with the deaf
- Attitudes of the public towards the handicapped people.
- Prevention of hearing impairment
- Management of hearing impairment
Meaning of deaf
Onaolapo (2004) defines hearing impairment as “The inability of the human ear to function adequatelyâ€. A person who has hearing impairment is unable to use his ear to understand speech.
He also quoted the conference of the executives of American schools for the deaf which described deaf as “those whose sense of hearing is not functional for the ordinary purposes of lifeâ€.
Also, according to Akinpelu (1999) there are many terms often used inter-changeably in describing people with hearing impairment. These includes, the deaf, hard of hearing, defective etc. but hearing impairment is the general term used to describe any form of hearing loss.
Furthermore, Frisina (1998) in his definition of hearing impairment, described the physical and educational dimensions of the handicap as: -
“A deaf person is one whose hearing is disabled to some extent that he or she cannot understand speech through the ear alone except with the use of hearing aids (p.3).
While “A hard-of-hearing person is one whose hearing is disabled to an extent that makes difficult, but not preclude the understanding of speech through the ear alone, with or without a hearing aid (p.3).
Signs associated with hearing impairment
A child can be said to have hearing impairment if he or she has difficulties in hearing the speech of other people in his/her own immediate environment. According to Ashonibare (2000), such a child would have to rely on some devices to understand what is said, also his/her communication is unintelligible to listeners, he speaks below his age and cannot construct correct sentences.
According to Onaolapo (2003) the following signs are also associated with deafness: -
a. confusing words with sound alike.
b. Failure to carry out verbal instruction
c. Rubbing the ear constantly.
d. Turning the ears to one side to catch the sound or help attract the sound.
e. Watch the lip movement of the speaker instead of watching the eyes.
f. Following or bending forward to hear the speaker
g. Curbing the ear
h. Inability to talk by the age of 24 months
i. Hesitating to answer simple questions
j. Omission of sound of words after the age of 3 years.