Auditory System

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  1. Basics: 
    The cochlea is fluid filled and the ear canal is air filled, therefore, the middle ear must function in:
    Impedance matching
  2. Basics:
    What begins at the cochlea?
    Frequency analysis
  3. Basics: 
    Frequency peak displacement for higher frequency tones occurs where?
    Frequency peak displacement for lower frequency tones occurs where?

    Why is this?
    • Base
    • Apex
    • Increase in stiffness correlates to increase in amplitude (higher frequency)
  4. Basics: 
    Places on the basilar membrane correspond to different tones, this is known as
    tonotopical organization
  5. Basics: 
    The basilar membrane essentially functions as many what?
    What is this?
    • overlapping band pass filters
    • A band pass filter allows certain frequencies to pass, but not others
  6. On what scale is the stiffness of the basilar membrane?
    What does the basilar membrane break a tone into?
    Which is a damaged cochlea (active or passive)?
    • logarithmic 
    • amplitude components
    • passive: the energy in this cochlea will be lost over time, an active cochlea overcomes frictional forces of the coclear fluid.
  7. Sensory information from the hearing mechanism is picked up by:
    Motor information is carried to the hearing mechanism by:
    Is there inhibition in the auditory nerve?
    • Inner Hair Cells
    • Outer Hair Cells
    • No
  8. These IHC carry action potentials, which occur more frequently in the presence of:
    and where specifically:
    As ____ is increased, the _______ _____ increases as well until total __________ is met.
    • a tone, but they also fire spontaneously
    • at the peaks of the sine wave (not the troughs)
    • Sound Pressure Level (SPL)
    • firing rate (of APs)
    • saturation
  9. There are two ways to code an action potential:
    • 1. Based on counting the number of action potentials in a given time (rate)
    • 2. Based on temporal coding determined by phase locking
Card Set:
Auditory System
2013-10-22 02:51:05
Auditory Neuro SLP

Brief description of Auditory system's physiology in relation to the brain
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