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25 True/False questions

  1. Masking-NOISE ALWAYS IN BETTER EAR!! (NTE)

    -The noise that you put in the ear you're not testing.
    -We mask b/c it is possible that the good ear is hearing the sound.

          

  2. How to Mask:
    SRT
    •PL WR(TE) - 25 dB

          

  3. Interaural Attenuation (IA)-Amount of sound energy lost as sound travels from one ear to another via bone conduction
    -Most often related to bone conduction
    -Varies from person to person (we mask to be sure)
    -Varies across signal
    -You have to be above this level before they can hear it; how much is lost

          

  4. IA Conservative Values:
    Pure-tone AC
    •0 dB; but can vary from person to person

          

  5. Minimal Masking Levelwhenever you put noise in the ear, your brain tries to shut the noise down b/c it recognizes that its noise and it tries to turn it down to "ignore" it -> this is how we hear in noise. When you out noise in their threshold may shift 5-10 dB because of the noise.

          

  6. IA Conservative Values:
    Pure-tone BC
    •Headphones- 40 dB HL

    •Inserts- 50 dB HL; depends on how well you got the insert in the ear

          

  7. Central masking shift-you could start without the pad, you will just have to turn it up a lot more; the minimum it is going to take mask

    -Plateau: start at starting level, present tone. If they get it the noise goes up. If they don't turn the tone up. You need to turn the noise up 3 5 dB steps in order to get the plateau

          

  8. When to Mask:
    SRT
    •PL WR(TE) - SRT(NTE) ≥ 35 dB HL
    •PL WR(TE) - Best Bone(NTE) ≥ 35 dB HL

    •When SRT(NTE) and WR(TE) differ by 30 dB

          

  9. Occlusion Effect (OE) for BC•250 Hz: 20 dB
    •500 Hz: 15 dB
    •1000 Hz: 5 dB

          

  10. When to Mask:
    AC
    •A 40 dB difference b/w AC of the test ear and the non-test ear

    •AC(TE) - AC(NTE) ≥ 40 dB HL (50 dB HL)
    •AC(TE) - BC(NTE) ≥ 40 dB HL (50 dB HL)

          

  11. Shadow Curvewhat gets to the other side in the NTE

          

  12. When to Mask:
    WR
    •AGB ≥ 15 dB

          

  13. Conservative Values-how much is it going to take for that cochlea to not pick it up

    •crossover + pad (10 to 15 dB)

          

  14. Effective Masking-how much is it going to take for that cochlea to not pick it up

    •crossover + pad (10 to 15 dB)

          

  15. How to Mask:
    WR
    •PL SRT(TE) - 35 dB

          

  16. IA Conservative Values:
    SRT
    •35 dB HL

    •WR is 30 or 40 dB SL above SRT threshold. Because we jump so much louder Interaural attention will crossover much quicker b/c we are louder.

          

  17. OvermaskingWhen the test signal will still be perceived in the NTE b/c of an insufficient amount of masking noise presented to the NTE

          

  18. How to Mask:
    AC
    •Better ear + pad (10 to 15 dB) + OE
    •AC(NTE) + pad + OE

          

  19. Plateau Method•Use for masking AC & BC
    •Range of intensities (b/w under- and over- masking) that will permit effective masking. This is possible when the thresh in the TE remains the same when masking is successfully increased in the NTE by 5 dB (3x consecutively)


    •The starting point is the masking level for either AC or BC
    •If they hear the tone, masking goes up 5 dB
    •If they don't hear tone, the tone goes up 5 dB
    •When we reach their real threshold, it doesn't matter how loud the masking gets

          

  20. When to Mask:
    BC
    •AGB ≥ 15 dB

          

  21. Masking with difficult populationsEXAMPLE:
    You can mask for a child that doesn't understand the directions or has intellectual disabilities or deficits by "listening for the birdie in the wind".

          

  22. How to Mask:
    BC
    •Better ear + Pad (10 to 15 dB)

    •AC(NTE) + pad (10 to 15 dB)

          

  23. UndermaskingWhen the test signal will still be perceived in the NTE b/c of an insufficient amount of masking noise presented to the NTE

          

  24. Crossoverwhat gets to the other side in the NTE

          

  25. IA Conservative Values:
    WR
    •35 dB HL

    •WR is 30 or 40 dB SL above SRT threshold. Because we jump so much louder Interaural attention will crossover much quicker b/c we are louder.