AUD 744 Overview of  Auditory Evoked Responses Transitional Audiology Program AUD 616  Auditory Evoked Responses Residenti...
<ul><li>Part 1  </li></ul><ul><li>Auditory Evoked Responses </li></ul><ul><li>Historical Overview </li></ul><ul><li>And  <...
<ul><li>1929 – Human EEG --  Berger </li></ul><ul><li>1930 – First paper on AEPs in general --    Weaver and Bray </li></u...
<ul><li>1950 – Summating Potential in animal      recorded –  Davis </li></ul><ul><li>1958 – Description of average respon...
<ul><li>1971 – ABR first described in animals -    Jewett </li></ul><ul><li>1971 – ABR response first described in      hu...
<ul><li>Electrical potentials in the human nervous system can be recorded both in response to specific external stimuli (e...
<ul><li>Non-Event Related   Event Related </li></ul><ul><li>EEG  ECochG </li></ul><ul><li>ABR </li></ul>Evoked Versus  Non...
<ul><li>Auditory Evoked Responses (AERs) represent electrical responses of the Auditory nervous system to externally prese...
<ul><li>AEPs can be classified according to whether their characteristics are determined by external or internal processes...
Classification of Auditory Evoked Responses Henry P. Trahan, Au.D. <ul><li>AEPs can be classified according to whether the...
Classification of AEPs <ul><li>AEPs can be classified according to the time epoch following the stimulus in which they occ...
The Family of AEPs
The Family of AEPs vertex positive I II III IV V VI N o P o N a P a N b P1 N 1 P2 N2 P300
 
Classification of AEPs <ul><li>AEPs can be classified according to the relation of the recording electrodes to the actual ...
<ul><li>Clinically, AEPs are almost always recorded at far-field., with electrodes located outside of the skull (extracran...
<ul><li>AEPs can be classified according to what structures in the auditory system generates them. </li></ul><ul><ul><li>R...
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General Principles Part 1 Historical And Classifications

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General Principles Part 1 Historical And Classifications

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  • General Principles Part 1 Historical And Classifications

    1. 1. AUD 744 Overview of Auditory Evoked Responses Transitional Audiology Program AUD 616 Auditory Evoked Responses Residential Audiology Program Henry P. Trahan, Au.D.
    2. 2. <ul><li>Part 1 </li></ul><ul><li>Auditory Evoked Responses </li></ul><ul><li>Historical Overview </li></ul><ul><li>And </li></ul><ul><li>General Principles </li></ul>
    3. 3. <ul><li>1929 – Human EEG -- Berger </li></ul><ul><li>1930 – First paper on AEPs in general -- Weaver and Bray </li></ul><ul><li>1930 – Earliest of AEPs discovered – Cochlear Microphonic – Weaver and Bray </li></ul><ul><li>1939 – First recorded alteration in EEG with auditory stim. in humans – P. Davis </li></ul><ul><li>1941 – CM recorded from round window in human through TM perforation – Pearlman and Case </li></ul>Historical Time Line Henry P. Trahan, Au.D.
    4. 4. <ul><li>1950 – Summating Potential in animal recorded – Davis </li></ul><ul><li>1958 – Description of average response computer (ARC) – Clark </li></ul><ul><li>1967 – AP with earlobe electrodes. ABR response first shown but reported as ECochG – Sohmer and Feinmesser </li></ul><ul><li>1971 – AP recorded in human w/external ear canal electrode – Saloman & Elberling </li></ul>Historical Time Line Henry P. Trahan, Au.D.
    5. 5. <ul><li>1971 – ABR first described in animals - Jewett </li></ul><ul><li>1971 – ABR response first described in humans – Jewett, Romano, Williston </li></ul><ul><li>1974 – CM, SP, and AP record in human w/ ear canal electrode -- Coats </li></ul><ul><li>1974 – Relationship between ECochG abnormalities and Meniere’s disease – Eggermont </li></ul><ul><li>1974 – Description of ABR in infants & young children – Hecox and Galambos </li></ul>Historical Time Line Henry P. Trahan, Au.D.
    6. 6. <ul><li>Electrical potentials in the human nervous system can be recorded both in response to specific external stimuli (event-related potentials [ERP] ) and in an ongoing manner without the presence of external stimuli (non-evoked or non-event related). </li></ul>Evoked Versus Non-Evoked Responses Henry P. Trahan, Au.D.
    7. 7. <ul><li>Non-Event Related Event Related </li></ul><ul><li>EEG ECochG </li></ul><ul><li>ABR </li></ul>Evoked Versus Non-Evoked Responses Henry P. Trahan, Au.D.
    8. 8. <ul><li>Auditory Evoked Responses (AERs) represent electrical responses of the Auditory nervous system to externally presented acoustic stimuli. </li></ul>Auditory Evoked Responses Henry P. Trahan, Au.D.
    9. 9. <ul><li>AEPs can be classified according to whether their characteristics are determined by external or internal processes ( exogenous vs. endogenous ) </li></ul><ul><li>AEPs can be classified according to the time epoch following the stimulus in which they occur. ( latency ) </li></ul><ul><li>AEPs can be classified according to the relation of the recording electrodes to the actual generator sites. ( Near Field vs. Far Field ) </li></ul><ul><li>AEPs can be classified according to what structures in the auditory system generates them . </li></ul>Classification of Auditory Evoked Responses Henry P. Trahan, Au.D.
    10. 10. Classification of Auditory Evoked Responses Henry P. Trahan, Au.D. <ul><li>AEPs can be classified according to whether their characteristics are determined by external or internal processes. </li></ul><ul><ul><li>Exogenous </li></ul></ul><ul><ul><li>Endogenous </li></ul></ul>
    11. 11. Classification of AEPs <ul><li>AEPs can be classified according to the time epoch following the stimulus in which they occur. </li></ul><ul><ul><li>Very Early (0 – 1.5 msec) (First) (CM, SP, N1) (ECochG) </li></ul></ul><ul><ul><li>Early (1.5 -12 msec) (Fast) Nerve and brainstem) (ABR) </li></ul></ul><ul><ul><li>Middle (12 - 50 msec) (thalamus and aud. cortex) (MLR) </li></ul></ul><ul><ul><li>Slow (50 – 300 msec) (1 o and 2 o areas of cortex) (ALR) </li></ul></ul><ul><ul><li>P300 (300+ msec) ( 1 o and association areas) (P300) </li></ul></ul>
    12. 12. The Family of AEPs
    13. 13. The Family of AEPs vertex positive I II III IV V VI N o P o N a P a N b P1 N 1 P2 N2 P300
    14. 15. Classification of AEPs <ul><li>AEPs can be classified according to the relation of the recording electrodes to the actual generator sites. </li></ul><ul><ul><li>Far-Field Response (Electrodes some distance away) </li></ul></ul><ul><ul><li>Near-Field Response (Electrodes in close proximity) </li></ul></ul>
    15. 16. <ul><li>Clinically, AEPs are almost always recorded at far-field., with electrodes located outside of the skull (extracranially), usually at the scalp. Two exceptions are: </li></ul><ul><ul><li>During intraoperative monitoring (when recording electrodes mat be placed directly on the VIIIth Nerve) and </li></ul></ul><ul><ul><li>During transtympanic membrane ECochG, (when a recording electrode may be placed on the promontory). </li></ul></ul>
    16. 17. <ul><li>AEPs can be classified according to what structures in the auditory system generates them. </li></ul><ul><ul><li>Receptor Potentials (cochlear hair cells) </li></ul></ul><ul><ul><li>Neurogenic Potentials (VIIIth N &/or brain stem) </li></ul></ul>Classification of AEPs

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