Exam 3 Part 3

Question 1

Electrical activity in response to a stimulus that can be picked up by electrodes on the head; measures physiological response

Answer 1

Auditory brainstem response

Question 2

ABR is an ____ test

Answer 2

Objective

Question 3

Can you fake an ABR?

Answer 3

No

Question 4

What is an ABR like for people who are deaf?

Answer 4

Action potentials won’t send and won’t see electrical activity

Question 5

What part of the EEG is an ABR?

Answer 5

Beginning

Question 6

What does the beginning of an ABR show?

Answer 6

Initial brainstem response

Question 7

What does wave I represent?

Answer 7

Distal 8th nerve and inner hair cells

Question 8

What does wave II represent?

Answer 8

Proximal 8th nerve

Question 9

What does wave III represent?

Answer 9

Cochlear nucleus

Question 10

What does wave IV represent?

Answer 10

Superior olivary complex

Question 11

What does wave V represent?

Answer 11

Lateral lemniscus and inferior colliculus

Question 12

Neurons firing at the same time

Answer 12

Neural synchrony

Question 13

What is neural firing like in a pathological ear?

Answer 13

Not firing at the same time; won’t be able to measure ABR

Question 14

Neural activity is measured along the…

Answer 14

ascending auditory pathway

Question 15

What type of stimulus do we use in ABR?

Answer 15

Evoked; usually clicking noises

Question 16

What are the 2 clinical implications we can make with ABR?

Answer 16

Inferences about hearing, inferences about site of lesion

Question 17

Behavioral hearing (AC) thresholds are __ dB better than the lowest level at which you can measure an ABR

Answer 17

10

Question 18

What wave is last to disappear in an ABR?

Answer 18

Wave V

Question 19

Why does wave V disappear in ABR?

Answer 19

As sound gets softer it takes longer for it to reach threshold in the inferior colliculus and get processed

Question 20

What happens to amplitude as you decrease the intensity of the stimulus?

Answer 20

Decrease

Question 21

Latency that is from initial stimulus to wave V

Answer 21

Absolute latency

Question 22

Time it takes to generate wave I to wave V; best measure to make inferences on

Answer 22

Relative latency/ neural conduction time

Question 23

What are some significant findings that we can use to determine the pathology of an ear?

Answer 23

Prolonged absolute latency, prolonged relative latency, intramural latency differences, absence of wave I and II, absence of ABR with normal or mild hearing, ABR is not replicable

Question 24

Tumor that can grow between the cochlear and vestibular nerve; always benign never metastasize

Answer 24

Acoustic neuroma

Question 25

Comparing absolute latencies between both ears

Answer 25

Interaural latency differences