The causes and degrees of hearing loss vary across the Deaf and Hard-of-Hearing community, as do methods of communication and attitudes toward deafness. In general, there are three types of hearing loss:
Conductive loss affects the sound-conducting paths of the outer and middle ear. The degree of loss can be decreased through the use of a hearing aid or by surgery. People with conductive loss might speak softly, hear better in noisy surroundings than people with normal hearing, and experience ringing in their ears.
Sensorineural loss affects the inner ear and the auditory nerve and can range from mild to profound. People with sensorineural loss might speak loudly, experience greater high-frequency loss, have difficulty distinguishing consonant sounds, and not hear well in noisy environments.
Mixed loss results from both conductive and sensorineural loss.
Given the close relationship between oral language and hearing, Deaf and Hard-of-Hearing students with hearing loss might also have speech impairments. One's age at the time of the loss determines whether one is prelingually deaf (hearing loss before oral language acquisition) or adventitiously deaf (normal hearing during language acquisition). Those born deaf or who become deaf as very young children might have more limited speech development.
- The inability to hear does not affect an individual's native intelligence or the physical ability to produce sounds.
- Some Deaf and hard-of-hearing students are skilled lipreaders, but many are not. Many speech sounds have identical mouth movements, which can make lipreading particularly difficult. For example, "p," "b," and "m" look exactly alike on the lips, and many sounds (vowels, for example) are produced without using clearly differentiated lip movements.
- Make sure you have a Deaf or hard-of-hearing student's attention before speaking. A light touch on the shoulder, a wave, or other visual signal will help.
- Look directly at a Deaf or hard-of-hearing person during a conversation, even when an interpreter is present. Speak clearly, without shouting. If you have problems being understood, rephrase your thoughts. Writing is also a good way to clarify. E-mailing and using the Relay Service very good communication alternatives outside of class.
- Make sure that your face is clearly visible. Keep your hands away from your face and mouth while speaking. Sitting with your back to a window, gum chewing, cigarette smoking, pencil biting, and similar obstructions of the lips can also interfere with the effectiveness of communication.
- Common accommodations for Deaf or hard-of-hearing students include sign language interpreters, Computer-Aided Realtime Transcription (CART), assistive listening devices, TTY/relay services, volume control telephones, signaling devices (e.g., a flashing light to alert individuals to a door knock or ringing telephone), priority registration, early syllabus, notetakers, and captions for films and videos.
Modes of Communication
Not all Deaf or Hard-of-Hearing students are fluent users of all of the communication modes used in the Deaf community, just as users of spoken language are not fluent in all oral languages. For example, not all Deaf or hard-of-hearing students lipread; many Deaf individuals use sign language, but there are several types of sign language systems. American Sign Language (ASL) is a natural, visual language having its own syntax and grammatical structure. Fingerspelling is the use of the manual alphabet to form words. Pidgin Sign English (PSE) combines aspects of ASL and English and is used in educational situations often combined with speech. Nearly every spoken language has an accompanying sign language. It is important to assign interpreters who will match the communication needs and preferences of each student. Interpreters convey all information in a given situation, including instructor's comments, class discussion, and environmental sounds.