331 13.1 Physiological Measures of Auditory Function

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331 13.1 Physiological Measures of Auditory Function
2012-03-21 00:57:49
physiological measures auditory function

physiological measures of auditory function
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  1. two major classes of physiological measures of auditory function
    • auditory evoked potential (AEP)
    • otoacoustic Emissions (OAE)
  2. Auditory Evoked Potentials (AEP)
    • electroencephalography (EEG)
    • ABR
    • electrocochleography (ECoG)
    • Auditory Midde Latency Response (AMLR)
    • Auditory Late Response (ALR)
    • Auditory P-300 Response (P300)
  3. Electroencephalography EEG
    • The measurement of brain potentials
    • we are trying to measure brain activity to sound
    • uses signals averaging to extract brain response to auditory stimuli
    • make a click then measure 10 milliseconds of info after it
    • this measures nerve firing not hearing
  4. main components of EEG
    • a ground wire on one ear lobe
    • a positive electrode on the top of head (or forehead)
    • a negative wire on the opposite ear lobe
  5. ABR
    2 primary uses
    • to determine the presence of Acoustic Tumors
    • the estimate auditory thresholds (detect presence of hearing loss)
  6. ABR to detect tumors
    • examine ABR latencies, interpeak latencies and compare ears
    • exam waveform morphology
  7. ABR normal v abnormal
    15 and 16
  8. to estimate thresholds
    obtain an intensity latency function
  9. ABR intesity - latency function
    charts 19 - 21
  10. electrocochleography ECoG
    2 ways to meaure
    • from ear canal
    • transtympanic
    • measures the cochlea
  11. electrocochleography ECoG
    • electrical activity of cochlea
    • cochlear implants
    • difficult to test
    • determination of Meniere's disease
  12. Auditory Middle Latency Response (AMLR)
    • difficult to measure because affected by subject state, muscle artifacts
    • detect hearing thresholds - limited
    • measures the thalamus down
  13. Auditory Late Response (ALR)
    • influenced by sedation, subject state
    • very time consuming
    • variabe responses limit usefullness
    • tests the auditory cortex down
  14. Auditory P300 Response
    • event related potential
    • typically recorded with "oddball" paradigm
    • allows studying of higher level auditory functions
    • measures the ability to hear a sound and react
  15. Otoacoustic Emissions (OAE)
    2 types
    • TEOAE - transient evoked otoacoustic emissions
    • POAE - distortion product otoacoustic emissions
    • both measure the same thing
  16. TEOAE
    • babies are now tested with this before they leave the hospital
    • this is not a test of hearing
    • this is a test of outer hair cells
    • A and B are measured in different registers (every other click)
    • outer hair cell test
  17. normal and abnormal TEOAE
    slides 37 and 38
  18. DPOAE
    • distortion products
    • the ear is non-linear (this means that it has distortion)
    • put two tones in get three out
    • we get a DP-gram
    • outer hair cell test