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BAEPs (Becca Book) Questions and Correct
Answers
BAEP electrodes Ans: Disk EEG electrodes applied with collodion
- sealed with plastic tape or sheet to prevent drying and provide
protection from blood or other fluids
- Bone wax secures the earphone, it does not protect the canal
from fluid entry
- subdermal needle electrodes secured similarly
WAVE Latencies Ans: WI: 1.4 msec
WIII: 3.4 msec
WV: 5.5 msec
Interpeak latencies
WI-III: 2.0msec
WIII-V: 2.0msec
WI-V: 4msec
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Wave anatomical landmarks Ans: WI: Distal CN VIII
WIII: Pons/ Superior olivary complex
WV: Midbrain/ Lateral lemniscus, Inferior colliculus
Active electrodes Ans: Cz: Active electrode fro waves II-V
(positive)
Ai: Active electrode for wave I only (negative) - also called N1
Ai&Ac= negative
Ai= ipsilateral side of stimulation/surgical side
Ac= contralateral to stimulation & non surgical
Cz= vertex
Left ear and Right ear names Ans: Left= Auris sinister (AS)
Right= Auris Dextrous (AD)
Function of the contralateral ear channel Ans: Validates white
noise masking is being presented at appropriate intensity
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Better identification of Wave V (Better IV-V split in the
contralateral ear)
White noise masking- 60dB pe SPL
prevents bone conduction cross over
Failure to use white noise masking Ans: Introduces false negative
Identification of Wave V Ans: May require decreasing stimulation
intensity by 5dB HL
Ipsilateral responses present, Contralateral absent Ans: Most
likely
1) gain or sensitivity turned down
2) Fluid gotten into pod and shorted out
Contralateral present, Ipsilateral absent Ans: Most likely due to:
1) Sensitivity/gain
2) fluid in pod
Conductive Hearing Loss Ans: AKA peripheral
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Involves: Ear canal, Tympanic Membrane, Middle ear
Changes in BAEP- Increase in absolute latencies, normal inter
peaks
Sensorineural hearing Loss Ans: AKA cochlear
Involves: Cochlea
Changes in BAEP- Normal or near normal at high click intensities
At lower click intensities increased absolute latency, normal inter
peak latencies
Retrocochlear Hearing loss Ans: AKA Central
Involves: Cranial Nerve VIII, brainstem
Changes in BAEP- Increased I-III or III-V and I-V
Eat Pizza Monthly Ans: eight cranial nerve
Pons
Mid brain (correlates with WV)
Kinked earphone tubing Ans: 1) Increase in absolute latency,
normal inter peak latencies
© 2025 All rights reserved
BAEPs (Becca Book) Questions and Correct
Answers
BAEP electrodes Ans: Disk EEG electrodes applied with collodion
- sealed with plastic tape or sheet to prevent drying and provide
protection from blood or other fluids
- Bone wax secures the earphone, it does not protect the canal
from fluid entry
- subdermal needle electrodes secured similarly
WAVE Latencies Ans: WI: 1.4 msec
WIII: 3.4 msec
WV: 5.5 msec
Interpeak latencies
WI-III: 2.0msec
WIII-V: 2.0msec
WI-V: 4msec
© 2025 All rights reserved
, 2 | Page
Wave anatomical landmarks Ans: WI: Distal CN VIII
WIII: Pons/ Superior olivary complex
WV: Midbrain/ Lateral lemniscus, Inferior colliculus
Active electrodes Ans: Cz: Active electrode fro waves II-V
(positive)
Ai: Active electrode for wave I only (negative) - also called N1
Ai&Ac= negative
Ai= ipsilateral side of stimulation/surgical side
Ac= contralateral to stimulation & non surgical
Cz= vertex
Left ear and Right ear names Ans: Left= Auris sinister (AS)
Right= Auris Dextrous (AD)
Function of the contralateral ear channel Ans: Validates white
noise masking is being presented at appropriate intensity
© 2025 All rights reserved
, 3 | Page
Better identification of Wave V (Better IV-V split in the
contralateral ear)
White noise masking- 60dB pe SPL
prevents bone conduction cross over
Failure to use white noise masking Ans: Introduces false negative
Identification of Wave V Ans: May require decreasing stimulation
intensity by 5dB HL
Ipsilateral responses present, Contralateral absent Ans: Most
likely
1) gain or sensitivity turned down
2) Fluid gotten into pod and shorted out
Contralateral present, Ipsilateral absent Ans: Most likely due to:
1) Sensitivity/gain
2) fluid in pod
Conductive Hearing Loss Ans: AKA peripheral
© 2025 All rights reserved
, 4 | Page
Involves: Ear canal, Tympanic Membrane, Middle ear
Changes in BAEP- Increase in absolute latencies, normal inter
peaks
Sensorineural hearing Loss Ans: AKA cochlear
Involves: Cochlea
Changes in BAEP- Normal or near normal at high click intensities
At lower click intensities increased absolute latency, normal inter
peak latencies
Retrocochlear Hearing loss Ans: AKA Central
Involves: Cranial Nerve VIII, brainstem
Changes in BAEP- Increased I-III or III-V and I-V
Eat Pizza Monthly Ans: eight cranial nerve
Pons
Mid brain (correlates with WV)
Kinked earphone tubing Ans: 1) Increase in absolute latency,
normal inter peak latencies
© 2025 All rights reserved
