Although middle ear infections are sometimes dismissed as a typical childhood illness, they can have a long term impact on a child’s ability to listen and comprehend speech. Middle ear infections may influence auditory development by rewiring the parts of the brain responsible for processing sound. This may result in the development of hearing deficits that last long after the infection clears. This article addresses the significant impact that middle ear infections can have on a child’s listening skills.
The first three years of life are critical for the brain’s development for processing speech sounds. As the child is exposed to speech in their environment the brain is putting together a toolkit of phonemic references, each of which represents a distinct speech sound in the language. These references are essential for distinguishing sounds and understanding speech. However, when a child experiences repeated middle ear infections, it can sound like listening through water. Throughout the different stages of the infection the clarity may vary, distorting the sound perception and resulting in inconsistent auditory input. Even after the infection clears, middle ear fluid can remain for months, often unnoticed because the child may not experience any pain, fever, or signs of congestion.
To further complicate things, during this early stage of life, children face the challenge of discerning slight variations within the way a phoneme sounds spoken by different genders and speakers with different accents. Additionally, they must recognize the influences of surrounding sounds that cause slight differences but still stay within the boundaries established for each speech sound.
Due to the inconsistency in speech sound perception, the brain cannot precisely map the phonemic boundaries to develop references for each sound. This causes the brain to eventually develop vague or overlapping representations of similar sounding speech sounds. Procedures such as pressure equalization ear tubes can reduce fluid accumulation, but they do not remove the child’s internalized sound references ingrained in the child’s mind.
The variations within the way speech sounds are perceived puts these children at high risk for developing an auditory processing disorder (APD), a type of listening problem that does not occur in the ear but rather in the pathways that transmit signals from the hearing nerve to auditory networks in the brain. As a result, individuals with APD struggle to process sound accurately and efficiently because the brain struggles to analyze the perceived sounds and turn sound into useful information. However, these listening difficulties are often overlooked since children can hear soft sounds and usually pass a basic hearing test.
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