Audiology and Hearing Loss

Question 1

Noise induced hearing loss is typically centered at ________

Answer 1

4kHz

Question 2

Hearing level on an audiogram is shown as ________ dB levels below the 0 dB reference and represents the ________ at that frequency

Answer 2

Positive, threshold shift

Question 3

Loss of hearing with age is termed _______

Answer 3

presbycusis

Question 4

The threshold of hearing refers to the SPL of _______

Answer 4

2 x 10-4 microbar or 0.0002 dynes/cm2

Question 5

The tympanum is part of the _______

Answer 5

Outer ear

Question 6

The bones of the middle ear are collectively called the __________

Answer 6

ossicles

Question 7

Sensory-neural hearing loss is caused by __________ to the hair cells and __________ be corrected by surgery

Answer 7

permanent damage, cannot

Question 8

What is conductive hearing loss?

Answer 8

degradation of the transmission of sound from the eardrum through the ossicles

Question 9

The hair cells, which are attached to the _________, are excited by the bulging of the _________ and send neural impulses to the brain via the __________

Answer 9

organ of Corti, basilar membrane, auditory nerve

Question 10

What is tinnitus

Answer 10

ringing or other sound produced spontaneously in the inner ear

Question 11

What is hyperacusis

Answer 11

A painful sensitivity to loud sounds

Question 12

The OSHA standards of 1971 allow a steady noise level of _______ for 8 hours/day

Answer 12

90 dBA

Question 13

the ______ of hair cells respond to low intensity levels, and are directionally sensitive

Answer 13

outer row

Question 14

Peak sound levels from short impulses do not reach the brain because of its _______, whereas they can reach the inner ear and cause damage

Answer 14

slow averaging time (200 ms)

Question 15

The outer ear consists of

Answer 15

Auricle, Pinna and ear canal

Question 16

The middle ear consists of

Answer 16

The ossicles - Malleus, Incus and Stapes (Hammer, Anvil, Stirrup)

Question 17

The inner ear consists of

Answer 17

cochlea and auditory nerve

Question 18

what is recruitment

Answer 18

non-linear amplification of sounds where normal level sounds are heard much quieter - but at a certain point are much louder

Question 19

what is diplacusis

Answer 19

loss of frequency sensitivity in one ear that results in pitch being heard differently in each ear

Question 20

what is central hearing loss

Answer 20

impairment resulting from defects in the central nervous system

Question 21

what is sensory-neural hearing loss

Answer 21

gradual reduction of hearing sensitivity in the cochlea through damage to the hair cells