APD is a symptom in which a person can hear sound but cannot understand what the other person is saying, and is considered a type of hearing loss.
There are several factors that cause such APD, and we will take a closer look at APD caused by brain damage among them.
Please refer to 4 types of APD in adults Characteristics and causes of each type for more information on the causes of APD.
Caused by stroke or brain hemorrhage
Brain damage can result in APD.
The main causes of brain damage are stroke or brain hemorrhage.
The brain has auditory nerves that transmit sound as electrical signals to the brain.
Damage to the middle of this nerve caused by a stroke or brain hemorrhage prevents sound from being properly transmitted to the brain.
As a result, the patient is unable to understand what is being said, even though there is no problem in the ear and the sound itself is audible.
This damage to the nerves can occur in one or both ears.
If it is unilateral, it is called unilateral central auditory dysfunction.
A CT or MRI can be done to see where in the brain the damage is located and tests to see how the brain perceives sound can be done to clarify APD.
In the case of stroke or brain hemorrhage, higher brain dysfunction may occur.
This is a cognitive impairment caused by brain damage. Even after this higher brain dysfunction subsides, the APD may remain.
Therefore, even after the higher brain dysfunction subsides, if you still have symptoms of not being able to understand what the other person is saying, it is a good idea to have a thorough examination to confirm the symptoms.
There are two patterns of damage: one ear and two ears
Brain damage has different symptoms in one ear and in both ears.
Let's take a look at how one ear and both ears differ.
Damage to only one ear
When only one ear is damaged, it is called unilateral central auditory dysfunction.
Basically, if only one ear is damaged, no problems appear in either pure tone or speech audiometry.
So it is very difficult to tell.
So when does the problem occur? When talking in a crowded place, or when making a phone call, or when being spoken to at the same time.
In the case of a person with damage to only one ear, there is no problem at all when listening to sound in one ear at a time.
The normal hearing test is done on one ear at a time, so the problem cannot be detected.
However, in the case of this person with damage in only one ear, if you say different words in the left and right and ask them to answer what they said, they instantly cannot understand the words in the damaged ear.
If you try to listen to different words in both ears at the same time, you will immediately lose the ability to hear in one ear.
This is called auditory elimination.
Therefore, in situations where sound information is coming from both ears, it becomes instantly more difficult to hear.
For example, when making a phone call, it is necessary to move to a quieter place to make the call.
Damage to both ears
If both ears are damaged, the symptoms are much more obvious than in the case of one ear.
Specifically, the patient can hear sounds but cannot understand what is being said at all, a symptom called deafness.
This is why the pure tone test does not show any problem, but the speech-listening test fails.
I don't understand what you mean when you can hear sounds but can't understand them! I think many people would agree.
What happens is that you are spoken to in a foreign language all the time.
For example, you are walking down the street and a foreigner comes up to you from across the street.
For example, you are walking down the street and a foreigner comes up to you from across the street.
…You can hear what they are saying, right? But can you understand what they are saying?
Word deafness is a symptom of this condition in Japanese.
You can already hear the sounds, so you must know what this is! This is beyond the scope of the "I am not a good person," right?
Coping with Brain Damage Type
To be honest, curing APD is difficult.
Therefore, it is important to understand the symptoms of APD and make them known to those around you.
For example, whether you have damage to one or both ears, explain at work or school that you have been left with these symptoms.
They should also be aware that they should move to a quieter place when making phone calls, and that they should try to receive information by text as much as possible.
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