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Auditory Perception
Auditory perception could be defined as the ability to receive and interpret information that reached the ears through audible frequency waves transmitted through the air or other means.
Detecting, identifying, recognizing, and understanding the sounds around you makes it possible to appropriately fit into your environment. It doesn’t only allow you to adapt on the street or at home, but as we’re social animals, it also allows us to communicate with others more easily and efficiently. As, the phone rings, and when you answer it, you hear your mom on the other side asking how you are. You’re able to quickly and easily decode what she’s saying, recognize her voice, and hear her emotional state in just the first few moments of the call. However, this seemingly simple task is actually very complex and requires the use of a number of brain areas that specialize in auditory perception.
Auditory Perception
This ability to interpret information that our different senses receive from the environment is an active process that depends on our cognitive processes and prior knowledge. There is a series of processes to follow in order to perceive the sounds:
Receive Information:
When an object vibrates, which is the case of the human voice (vocal cords vibrate), the waves produced by this action are transmitted by the air or other means. When these waves reach the inner ear, certain cells are activated.
Information Transmission:
The cells produce a signal that is transmitted through different nuclei until it finally reaches the medial geniculate nucleus in the thalamus.
Information Manipulation:
Finally, the auditory information received by the ear is sent to the auditory cortex in the temporal lobes. The information is manipulated and sent to the rest of the brain to allow you to interact with it.
Logically, auditory perception plays a very important role in our day-to-day lives, being present in almost every task we perform. It allows us to properly interact with our environment, communicate fluidly, alert us of any potential threats around us, and make it possible to enjoy music.
Starting from the moment your first class begins, auditory perception is a necessary part of academics, as it allows you to follow along and understand what the teacher is saying. Poor auditory perception without extra help, either with visuals or other resources, may cause comprehension problems when attending to a conversation or reading, causing poor performance in school.
Most jobs require the constant use of auditory perception. Fluid communication is the basis of working with customers, which is why auditory perception is important for efficient professional development.
Auditory perception is a key part of safe driving. In dangerous situations, the sound of another car’s horn can help keep your focus and alert you that something is wrong. Also, listening to the sound of the car and motor will tell you if there is anything wrong with the car and if you need to have it looked at.
For music, auditory perception is everything. If you want to play a song on the guitar or piano and have it sounds nice, you have to really put your auditory perception to the test and pay attention to every note. Listening to and perceiving music also generally requires auditory perception (although it is also possible to feel the vibrations and perceive it that way).
Disorders associated with auditory perception
An alteration in auditory perception may be due to a variety of problems of different levels.
The inability to perceive sounds or some kind of deficiency in this process is called deafness. This may be caused by damage to the receptive organs or in the pathways that bring information to the brain (hyperacusis and hyperacusis), or brain areas dedicated to heating (cortical deafness).
Perception does not work on its own. Specific damage, like stroke or brain injury, may alter each of the specific processes. These types of disorders are caused by damage to the specific parts of the brain that are in charge of the altered processes.
Wernicke’s aphasia refers to the inability to understand language (the patient will feel like they are hearing an unknown language).
Auditory agnosia is the inability to recognize a heard object, meaning that they will not recognize when someone refers to an object verbally. It may also cause an inability to perceive and appreciate music, which is known as amusia(unable to recognize or reproduce tones or musical rhythms). In some cases, it’s possible that the damage is more specific, losing only the ability to locate or imitate sounds.
Aside from the disorders that cause an impaired hearing, there are some disorders that cause the person to hear sounds that are not there. The most common of these disorders is tinnitus, which causes the person to hear a constant ringing. In other cases, the problem causes the brain to erroneously activate the auditory cortex, leading to hallucinations. This may occur in disorders like schizophrenia, where the hallucinations may be threatening. Other cases include musical hallucinations, where the person hears music as if it were coming from the radio, but isn’t able to turn it off. In the case of the paracusis of Willis, the auditory hallucinations are accompanied by weakened hearing.
Measuring auditory perception
With the help of a complete neuropsychological assessment, it is possible to efficiently and reliably assess a number of fundamental cognitive functions, like auditory perception. The tests that use to evaluate auditory perception were inspired by the classic NEPSY test from Korkman, Kirk, and Kemp (1998), the Test of Memory Malingering (TOMM), and the Test of Variables of Attention (TOVA). Aside from auditory memory, the tests also measure naming, reaction time, processing speed, contextual memory, working memory, cognitive flexibility, visual memory, visual perception, and recognition.
Identification Test COM-NAM: Objects are presented as an image or with sound. The user will have to identify if the object was presented as an image, as a spoken word, or if it was not previously presented.
Inquiry Test REST-COM: A series of images will be displayed for a short period of time. After, the user must choose the words that correspond to the images as quickly as possible.
Rehabilitate auditory perception
Every cognitive ability, including auditory perception, can be trained and improved. Brain plasticity is the basis of auditory perception rehabilitation and other cognitive skills. The brain and neural connections can be strengthened by challenging and working them, so by frequently training these skills, the brain structures related to auditory perception will become stronger. This means that when your ears send information to the brain and the brain processes it, the connections will work faster and more efficiently, improving overall your auditory perception. The key to improving auditory perception is adequate and consistent training. It only takes 15 minutes a day, two to three times a week.
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