Amplification - Monaural vs. Binaural

Question 1

If a person has HL in both ears, we will use _______ HAs for what two main reasons?

Answer 1

Binaural

1) better localization of sound sources
2) better understanding of speech in noise

Question 2

How does binaural HAs give better localization of sound sources?

Answer 2

The CNS compares time and intensity cues to determine where the sound is coming from

Question 3

How does binaural HAs give better understanding of speech in noise?

Answer 3

The “binaural squelch” effects can better seperate a signal from noise when it comes to both ears

Question 4

Aside from better localization, what are 2 more reasons for binaural HAs?

Answer 4

1) “head shadow” effect

2) less overall gain

Question 5

What is the “head shadow” effect

Answer 5

Person can hear equally well from both sides of the head

Question 6

Why is less gain overall needed with binaural (rather than monaural) fittings?

Answer 6

The binaural summation effect, the sound from each sides add together to be louder

Question 7

If a person has HL in just one ear what do we do?

Answer 7

Typically, fit one HA and follow normal procedure

Question 8

What is a special case when someone as unilateral HL and we dont do monaural fittings?

Answer 8

The HL is too sever, and the combo of its degree and its distortion is too great

Question 9

What are 3 types of people that should not be overlooked as HA candidates?

Answer 9

1) have difficulty with localization
2) difficulty in noise
3) difficulty when signal is on bad side

Question 10

Research reported ___% of children with one normal and one unaidable ear did what?

Answer 10

35%

Failed at least one grade (10x the normal rate)