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Instructor Guide - National Association of Landscape Professionals

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... Why do they test baby’s hearing when they are born? Deafness is the most common of all birth defects. Every day 33 babies in the United States are born with some form of hearing loss. That equates to around 12,000 babies every year. Before we started testing babies in the hospital, the average age a ...
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... identifiable etiology.1 Sudden SNHL affects between 5 and 20 persons per 100,000 year or approximately 4,000 new cases annually in the United States.2 The HL is nearly always unilateral and is commonly associated with tinnitus and aural fullness. The true incidence of sudden SNHL is probably underes ...
Exploring a Cochlear Implant - Hearing Loss Association of America
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... •Preparation (academic and practical) of hearing aid dispensers ◊What's typical in the industry? Apprenticeship. ◊Should audiologists apologize for only one course? Like Tom Coffman suggested (Phonak rep). ◊Much of (non-audiologist) coursework is included in our basic courses. An example is Ernie Ze ...
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Sensorineural hearing loss



Sensorineural hearing loss (SNHL) is a type of hearing loss, or deafness, in which the root cause lies in the inner ear (cochlear), vestibulocochlear nerve (cranial nerve VIII), or central processing centers of the brain. Sensorineural hearing loss can be mild, moderate, severe, profound, or total.The great majority of human sensorineural hearing loss is caused by abnormal structure or function of the hair cells of the organ of Corti in the cochlea. There are also very unusual sensorineural hearing impairments that involve the eighth cranial nerve (the vestibulocochlear nerve) or the auditory portions of the brain. In the rarest of these sorts of hearing loss, only the auditory centers of the brain are affected. In this situation, cortical deafness, sounds may be heard at normal thresholds, but the quality of the sound perceived is so poor that speech cannot be understood.Sensory hearing loss is due to poor hair cell function. The hair cells may be abnormal at birth, or damaged during the lifetime of an individual. There are both external causes of damage, like noise trauma and infection, and intrinsic abnormalities, like deafness genes.Neural hearing loss occurs because of damage to the cochlear nerve (CVIII). This damage may affect the initiation of the nerve impulse in the cochlear nerve or the transmission of the nerve impulse along the nerve. Hearing loss that results from abnormalities of the central auditory system in the brain is called central hearing impairment. Since the auditory pathways cross back and forth on both sides of the brain, deafness from a central cause is unusual.Sensory hearing loss can also be caused by prolonged exposure to very loud noise, for example, being in a loud workplace without wearing protection, or having headphones set to high volumes for a long period. Exposure to a very loud noise such as a bomb blast can cause noise-induced hearing loss.
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