How do you mask in pure tone audiometry?

How do you mask in pure tone audiometry?

Test procedure

1. Perform air conduction audiometry unmasked for both ears.
2. Perform bone conduction audiometry unmasked for both ears.
3. Apply masking if needed:
4. Select NB in channel 2.
5. Select which ear to mask and choose the appropriate masking transducer (headphones or insert phones).

How do you know when to mask an audiogram?

Earphones that go around the ear run into cross-over problems when the sound is about 40 db or louder. Earphones that go into the ear (inserts) have problems at about 60 db. Thus if the ears are both normal, masking is not needed. One should always mask air conduction if there is a 40db or greater threshold.

What is maximum masking level?

“Maximum masking level” means “the maximum level of noise that can be used in the non-test ear that can be used that will not change the true threshold or response in the test ear” Yacullo (2000, p. 98).

How do you calculate mask?

After measuring the bone-conduction threshold using the MMax approach, calculate the minimum masking level with the usual formula, using the threshold you just established. Minimum Masking Level = BC threshold + (OE + NTE ABG) + 10 dB. Ensure that MMax was greater than or equal to the minimum level.

What is under masking?

Undermasking  Not using enough noise in the non-test ear  The obtained threshold is really the response of the non-test ear.

What is masking plateau?

In clinical masking, the plateau is a state in which the non-test ear (NTE) is completely masked by the noise and tone is heard only by the test ear (TE). At least 15 to 20 dB of plateau width is needed to obtain valid threshold.

What is effective masking?

EMLs are determined by presenting the signal and the masker to the same ear; effective masking refers to the lowest level of noise required to mask a signal to 50% probability of detection for a large group of normal-hearing adults (e.g., Hood, 1960 ; Studebaker, 1967).

How do you calculate pure tone average?

Hearing sensitivity within the speech frequencies is known as the pure-tone average (PTA) and can be calculated by adding the thresholds obtained at 500, 1000, and 2000Hz and dividing the result by 3. For audiometric results to be valid, the patient must respond to stimulation of the ear being tested.

What is the occlusion effect in masking?

The Occlusion Effect. The occlusion effect is an increase in the amount of bone-conduction sound entering the cochlea when that ear is covered (occluded). This occurs when you are masking because we must cover the non-test ear in order to deliver the air-conduction masking noise.

What are the masking techniques back and reverse masking?

Temporal masking refers to masking (i.e., obscuring of one sound by another) that occurs when a signal and a masker are not presented simultaneously. Backward masking occurs when the masker follows the signal; forward masking occurs when the masker precedes the signal (Fig.