(Testing of Hearing Acuity ) Audiometry Testing of Hearing Acuity: The test will

Question

(Testing of Hearing Acuity )

Audiometry

Testing of Hearing Acuity:
The test will examine the minimal threshold (energy of sound wave, decibels or dB) for hearing in both left and right ears at the

following frequencies (125 Hz, 250 Hz, 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz, and 8000 Hz). At each frequency, you will determine the level at which the sound can just be heard. The level below this will not be heard and the level of above will result in a greater response in the cochlea leading to a response within the cochlea or a sense of the sound being “louder”. By determining the minimal threshold you will be able to develop an audiogram that maps the function of the cochlea or the ability for the person to hear or their level of deafness. Note that the subjects should be able to respond at energy levels of at most 50dB between 750 and 4000 Hz, normal range of frequencies of speech. Anything above this threshold level can be seen as an indication of receptor desensitization and can progress to deafness at the frequency. There are several factors that can lead to changes in the responsiveness of the cochlea that include, history of loud noise exposure and age (just to name a few). Based on noise in the lab-room, results you obtain in laboratory do not accurately reflect your hearing ability due to extraneous noise.

In your own words, What can you determine about your ability to hear? Why is there a loss at these specific frequencies? Describe the results of this test if one of the subjects exhibited " Sensineural Deafness" versus "Conductive Deafness"? Can one tell from this experiment if any apparent hearing loss is due to sensineural or conductive deafness? why? or why not?

Explanation / Answer

Conductive deafness occurs when there is a problem conducting the sound waves through external ear,tympanic membrane,middle ear

Sensineural deafness occurs when there is problem conducting the sound waves through cochlea,internal ear

To determine the ability to hear

Conductive deafness-Tuning fork tests -Rinne's test -ve[BC>AC]

Weber's test lateralised to bad ear,

Absolute bone conduction-Normal

Audiometry test-In audiogram,AB gap i.e,gap between air conduction and   

Bone conduction is 10DB,speech discrimination normal

Semineural deafness-Tuning fork tests-Rinne's test +ve[AC>BC]

Weber's test-Lateralised to good ear,

Absolute bone conduction-decreases

Pure tone audiometry test-In audiogram the AB gap between air conduction

Bone conduction is 5DB,speech discrimination is poor

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