See also: What are A§E tests?


A§E contains two localization tests: (1) Azimuth localization and (2) ILD localization.


  • The azimuth localization is a typical localization test with 5 or 7 loudspeakers. This test requires the SoundC hardware.
  • The ILD localization test only requires 2 loudspeakers. It assesses the localization acuity based on high frequency interaural level differences and is mainly useful to evaluate cochlear implant recipients.


Azimuth Localization


The azimuth localization is based on stimuli presented through multiple loudspeakers of SoundC (currently 5 or 7 speakers).


A§E azimuth localisation results. Sound was presented from 7 loudspeakers 
and the listener had to point to the speaker he/she perceived to be source.


Supported apparatus for Localization tests are: Amplifier & Speakers and SoundC (currently 5 or 7 speakers).


Procedure

  1. Select A§E Azimuth Localization in the ribbon and click on New Measurement
  2. Select SoundC from the drop-down list
     
  3. In the Training mode, click on one of the speakers to send the stimulus to that speaker.
  4. In the  Test mode, Audiqueen plays a stimulus and the listener should point to the speaker he/she feels the sound is coming from. Click on this speaker icon to enter the response.
  5. After the last presentation, Audiqueen plots an XY graph showing the median responses as a function of the real sources.

It also calculates the RMS value as a measure of the error compared to the normal line.  

The RMS is calculated as the root mean square for all speakers of (the median response – the normal response)


 



Where 

  • RS = the median response for Speaker S
  • N = the number of speakers
  • norm = the normal value for Speaker S


ILD localization



The A§E ILD localization test is based on narrow band noise centred at 4000 Hz which is presented through two loudspeakers with different intensities to create an interaural loudness difference. This is used to assess the localization capacity as indication of the central integration of binaural input.


Procedure

See this page to set up your hardware correctly (very important!).



  1. Select A§E ILD Localization in the ribbon and click on New Measurement
  2. Select the machine from the drop-down list
  3. Use the controls to select binaural as test ear and the conduction and the presentation level
  4. In the Training mode, you can click on one of the speakers to present sound coming from that direction.
  5. In the  Test mode, Audiqueen presents the stimulus with different ILDs (randomly), to simulate different sound sources and the patient should point to one of the (sham) speakers that he/she thinks is the real source.
  6. After the last presentation, Audiqueen calculates 2 values: (1) the variance of the responses, as indication of the reliability of the patient's responses; and (2) the RMS value as a measure of the error compared to the normal line.
    The variance is calculated as the average of the absolute value of every (score -  the corresponding median score)


The RMS is calculated as the root mean square for all ILDs of (the median response – the normal response)

 



Where 

  • RILD = the median response at a given ILD
  • N = the number of ILD values
  • norm = the normal value for each ILD value

Instructional videos

Yoy may also have a look at the following video’s ILD localization:




Test Rationale


 
 

Typical Test Procedure




See also: How to perform A§E selftests?


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