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Audiological Techniques 2 > Auditory Brain Response > Flashcards

Auditory Brain Response Flashcards

1
Q

What is the Early latency potentials in ABR?

A

0-10ms

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2
Q

What is the function of the Cochlear Nerve?

A

Contrasting enhancement/subtle changes in amplitude

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3
Q

What is the function of the Superior Olivary Complex?

A

Structure to the processing binaural input- important for localisation

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4
Q

What is the Lateral Lemniscus?

A

Primary ascending auditory pathway

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5
Q

What is the Inferior Colliculus?

A

Structure for localising sound sources & speech encoding

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6
Q

What is the Thalamus?

A

Way station between brainstem & cortex

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7
Q

What is the Medial Geniculate Body?

A

Auditory nucleus of the Thalamus

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8
Q

What are the 3 electrodes?

A

Active, Reference & Ground

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9
Q

What should the impedance check measures be?

A

<10kOhms ideally 5 or less
All 3 must be similar in measurements

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10
Q

When do we use ABR’s?

A

Testing neonates who fail newborn screening
Uncooperative children/adults or disabilities
Non-organic HL

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11
Q

What else can we use ABR’s for in terms of investigation?

A

Retro-cochlear tumours
Auditory Neuropathy Spectrum Disorder
Surgical procedures that place risk of injury to auditory structures

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12
Q

Define ABRs

A

Involuntary and objective test
Neurophysiological reaction from the auditory system following a sound
Non-invasive method that’s quick to perform

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13
Q

What are the x and y axis on an ABR waveform graph?

A

Amplitude and Latency

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14
Q

What are the sound stimuli that can be used in ABRs?

A

Click
Tone burst
Chirps

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15
Q

Why is signal averaging required for ABRs?

A

To improve the S:N
Signal to noise
Amplify

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16
Q

What is Exogenous?

A

Signal related AEPs
ABRs are exogenous

17
Q

What is Endogenous?

A

Event related
Responses dependant on the processing of the stimulus

18
Q

What are the 2 types of ABR?

A

Threshold and Diagnostic

19
Q

Define Threshold ABR

A

Gives objective estimate of what stimulus level a synchronous neural response happens

20
Q

Define Diagnostic ABR

A

Focuses on neurological analysis of auditory system

21
Q

What can ABRs be used for?

A

Hearing threshold estimation
Intraoperative monitoring
Or neurological assessment of the ascending auditory pathways

Audiological Techniques 2 (6 decks)

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