AER

Question 1

What are AEPs

Answer 1

AEPs are a measure of the electrical activity produced by the cochlear and veestibulo-cochlear nerve, brainstem and other auditory sites up to the brain.

Question 2

How do you measure AERs (2)

Answer 2

1. Amplification of AER (by 100,000 times)

2. Signal averaging technique (enhancing the signal and reducing the noise)

Question 3

What are the pathological impacts on AERs (6)

Answer 3

1. Age - VIII nerve mature by age 1, auditory brainstem 3-4 years, thalamus by 8- 12 years and degrade by 50-60 years
2. Females have better AEPs
3. Body temperature - cold reduces latency and increases amplitude
4. State of arousal
5. Drug effects
6. Muscular artefact

Question 4

What are the non-pathological impacts on AER

Answer 4

1. Stimulus factors (click or tone burst)

2. Intensity level

Question 5

What is a differential amplifyer

Answer 5

Increases the signal to noise ratio

Question 6

What is Common Mode Rejection Ratio

Answer 6

10,000 reduction is good

Question 7

Analogue to digital averaging procedure

Answer 7

IDK