Auditory Brain Response Flashcards
What is the Early latency potentials in ABR?
0-10ms
What is the function of the Cochlear Nerve?
Contrasting enhancement/subtle changes in amplitude
What is the function of the Superior Olivary Complex?
Structure to the processing binaural input- important for localisation
What is the Lateral Lemniscus?
Primary ascending auditory pathway
What is the Inferior Colliculus?
Structure for localising sound sources & speech encoding
What is the Thalamus?
Way station between brainstem & cortex
What is the Medial Geniculate Body?
Auditory nucleus of the Thalamus
What are the 3 electrodes?
Active, Reference & Ground
What should the impedance check measures be?
<10kOhms ideally 5 or less
All 3 must be similar in measurements
When do we use ABR’s?
Testing neonates who fail newborn screening
Uncooperative children/adults or disabilities
Non-organic HL
What else can we use ABR’s for in terms of investigation?
Retro-cochlear tumours
Auditory Neuropathy Spectrum Disorder
Surgical procedures that place risk of injury to auditory structures
Define ABRs
Involuntary and objective test
Neurophysiological reaction from the auditory system following a sound
Non-invasive method that’s quick to perform
What are the x and y axis on an ABR waveform graph?
Amplitude and Latency
What are the sound stimuli that can be used in ABRs?
Click
Tone burst
Chirps
Why is signal averaging required for ABRs?
To improve the S:N
Signal to noise
Amplify
