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Evoked potentials 2

Auditory evoked potentials

QuestionAnswer
Primary auditory cortex is Brodmann's area __ 41
The routinely used BAERs are __ latency BAERs short
Typical short latency BAERs are up to __ msec in duration 10
Middle latency BAERs range from __ to __ msec in duration 10, 50
Long latency BAERs have a duration greater than __ msec 50
The two types of equipment used to deliver sounds for AEPs headphones, earplugs
____ are the type of equipment used to delivery sound in intraop monitoring earplug headphones
__ are the most common type of equipment used to deliver sound for BAERs headphones
Most BAEPs are generated in response to: pips, clicks, knocks clicks
A sound __ is generated by giving a square wave electrical impulse into a speaker click
Sound __ are given with alternative positive and negative polarity, which produces clicks in which the speaker diaphrgm moves towards and away from the eardrum clicks
Compression of the air in the external auditory canal by movement of the diaphragm towards the eardrum is termed __ condensation
Decompression of the air in the extenal auditory canal by movement of the diaphragm away from the ear is called __ rarefaction
Clicks have a duration of approximately __ microseconds 100
The stimulus rate for short BAEPs is __ to __ per second 8, 10
The stimulus rate for middle latency AEPs is __ to __ per second 8, 10
The stimulus rate for ECochG is __ to __ per second 8, 10
The stimulus rate for sonomotor AEPs is __ to __ per second 8, 10
The stimulus rate for long latency AEPs is less than __ per second 1
____ refers ti the average threshold intensity found in young health adults when tested with pure tones with > 0.5 seconds duration hearing level
___ is similar to hearing level but specific to a particular stimulusm especially since the threshold for tones of > 0.5 seconds may be different from the threshold for the threshold for clicks or shorter tones normal hearing level
Hearing level refers to the average threshold intensity found in young healthy adults when tested with pure tones of at least __ seconds duration 0.5
___ is the hearing threshold for a specific individual sensory level
Sensory level for an individual with normal hearing for sustained pure tones is equivalent to __ __ hearing level
Sensory level for non-sustained tones or other stimuli in an individual with normal hearing is equivalent to ______ normal hearing level
Auditory threshold testing is usually measured by altering the intensity in __ dB steps 5
___ is a physical measure of sound intensity which ignores physiologic transduction and detection of stimuli sound presure level
The zero pressure level for sound pressure level at 1000 Hz is set at ___ dynes/cm2 or __ microPa. 0.00002, 20
___ is determined bt comparing the peak-to-peak amplitude of the stimulus with the amplitude of a sine-wave of a pure tone having the same peak-to-peak amplitude as the click peak equivalent sound pressure level
Typical stimulus intensity peSBL in dB is frm __ to __ 115, 120
___ are brief sounds of a specific frequency tone pips
__ frequency tone pips typically cannot be very brief low
Low frequency tones are encoded at the __ of the cochlea apex
The steady state middle latency BAEP is produced by tone bursts at various frequncies repeated at __ per second 40
FFP Frequency following potential
Intensity is typically __ to __ dB SL 60, 70
Broadband clicks are typically produced by __ microsecond electrical square wave pulses into a speaker 100
The most common ground for BAEPs Fz
The most common number of averaged responses for BAEPs 2000
The typical sweep length for BAEPs is at least __ msec 15
The minimum sampling rate is __ / second 10000
The maximum sampling interval for BAEPs is __ microseconds 100
Channel one in a BAEP is typically: Cz-A1
Channel two in a BAEP is typically: Cz-A2
The typical low frequency filter for BAEP ranges from __ to __ but with mechanical or EMG artifact can be up to __ to __ 10, 30, 100, 200
The typical high frequency filter from BAEPs is from __ to ___o 1000, 4000
Increased BAEP threshold indicates a __ lesion in BAEPS (central / peripheral / possible central) peripheral
Absence of waves I - V unexplained by extreme hearing loss of technical problems indicates a __ lesion in BAEPS (central / peripheral / possible central) central
Absence of waves following wave I or wave III indicates a __ lesion in BAEPS (central / peripheral / possible central) central
Abnormally long peak latency V on rapid repetitive stimulation indicates a __ lesion in BAEPS (central / peripheral / possible central) possible central
Increased latency of waves I - V indicates a __ lesion in BAEPS (central / peripheral / possible central) peripheral
Abnormal decrease of the V/I amplitude ratio, esp. when associated with other abnormalities, indicates a __ lesion in BAEPS (central / peripheral / possible central) central
Abnormal long peak latency III and V indicates a __ lesion in BAEPS (central / peripheral / possible central) possible central
Abnormal latency-intensity curves indicates a __ lesion in BAEPS (central / peripheral / possible central) peripheral
Abnormal long interaural difference of ipsilateral I-V unexplained by middle or inner ear problems identifiable on audiometric tests indicates a __ lesion in BAEPS (central / peripheral / possible central) central
Abnormally increased interpeak latency I-III, III-V indicates a __ lesion in BAEPS (central / peripheral / possible central) possible central
Sound is conducted via bone conduction to the contralalteral ear, but the sound is attenuated by __ to __ dB 50,60
Sonomotor AEPs are recorded using electrodes over the __ or __ muscles neck, scalp
Short latency BAEPs are recordeed so that an __ (upward/downward) deflection means positivity at the vertex upward
Medium latency BAEPs are recorded so that a __ deflection means positivity at the vertex downward
Long latency BAEPs are recorded so that a __ deflection means positivity at the vertex downward
Wave __ is absent in many normal BAEPs II
Wave __ is commonly fused in normal BAEPs IV
Wave I is generated by the ___ acoustic nerve
Wave I is generated by the __ (proximal/distal) portion of the acoustic nerve distal
Wave III is generated by projections from the __ through the __ superior olive, lateral lemniscus
Wave V is generated by projections from the __ to the __ pons, midbrain
Wave __ is seen only ipsilateral to the stimulus I
Separattion of wave IV and V is more prominent __ (ipsilateral / contralateral) to the stimulus contralateral
Wave __ is the last wave to be last with reduced stimulus intensity V
Wave __ may be split and reversed with a change in click polarity III
In order to distinguish wave I from ___, try reversing the polarity of the stimulus cochlear microphonic potential
In order to distinsguish wave I from the cochlear microphonic potential, try ____ reversing polarity of the stimulus
Wave III is equidistant between waves __ and __ I, V
Waves II and III occasionally occurs __ (ipsilateral / contralateral) to sound stimuli contralateral
Which of the following is not a way to aid identification of wave V: (A) recording from the ipsilateral ear, (B) reducing stimulus intensity, (C) changing stimulus polarity recording from the ipsilateral ear
Which of the following is not a way to aid identification of wave V: (A) recording from the contralateral ear, (B) increasing stimulus intensity, (C) changing stimulus polarity increasing stimulus intensity
BAEPs may be absent in infants before age __ weeks conceptual age, but have been recorded as early as __ weeks conceptual age 30, 25
As conceptual age increases, wave __ latency decreases, and the wave I - V interpeak latency decreases by ~ __ - __ msec from 25 to 44 weeks conceptual age V, 2, 3
The wave V latency in infants shortens most prominently from week __ to __ 32, 34
As infants grow to adulthood, there is a __ to __ msec reduction in I - V ipsilateral 0.8, 1
Wave I latencies reach adult values by about __ __ of age 6 weeks
Interpeak latency I - V reaches adult levels by about __ __ of age 18 months
Females have slightly __ (shorter/longer) peak and interpear latencies of the BAEP than males shorter
The difference between males and females in peak / interpeak latencies is seen after age __ 8
An increase in the BAEP stimulus about __ per second increases the latency and decreses the amplitude of the BAEP 30
An increase in stimulus rate above 30 __ (increases/decreases) latency and __ (increases/decreases) amplitude increases, decreases
The increased latency at stimulus rates > 30 / second is best seen in wave __ V
Clicks of rarefaction and condensation produce differences in response __ latency
Contralateral recordings are characterized by short latencies of waves __ and __ and longer latencies of waves __ and __ III, IV, II, V
Contralateral recordings cause shorter interpeak latencies from waves __ - __ and longer latencies from __ - __ II, III, IV, V
Wave I latency (male or female) 2.1
Wave V/I amplitude ratio (male or female) 0.5
I - III interpeak interval, male 2.55
I - III interpeak interval, female 2.4
III - V interpeak interval, male 2.35
III - v interpeark interval, female 2.2
Reduction of wave V alone suggests a lesion in the __ midbrain
If wave I cannot be definitively determined, this is used instead negative wave preceding II
Reduction in stimulus intensity typically increases the __ in wave V latency
Created by: schmittse
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