![]() ![]() If any or all are affected, the brain will receive a disorganized signal (hard to understand) or no signal at all (functionally deaf). A defect in the inner hair cells, the auditory nerve, the connection between them or the connection between the nerve and brain can lead to ANSD. Damage to any of these sites may lead to hearing loss. The inner ones are responsible for 95% of the information sent to the brain via the auditory nerve, while the outer cells amplify the sound stimulus. Those vibrations are then transmitted via a series of bones to the cochlea, a fluid-filled structure with a membrane that contains two types of cells: outer and inner hair cells. When they arrive at the eardrum, it vibrates. Sound waves usually enter thought the outer ear and travel via the ear canal. However, improvement depends on the severity of the impairments, the underlying cause and the treatment’s efficacy. When a child is followed over time, spontaneous improvement is possible clinically by 12 months, and stabilization may happen around 18 months. ![]() Speech discrimination can range from no difficulty distinguishing sounds to difficulty discriminating sounds in a quiet environment. In children, speech may develop naturally or be delayed. Thus, sometimes ANSD is not detected in the early stages and symptoms can only be noticed over time. Newborn hearing screening protocols are not the same everywhere. Difficulty determining where a sound is coming from.Difficulty understanding speech especially in noisy environments. ![]()
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