Sensorineural
hearing is the transmission of sound stimuli through the neural components of
the inner ear and cranial nerve. A vibrating tuning fork is placed on the
mastoid process and the patient indicates when the sound produced from this is
no longer present. Then the fork is immediately moved to just next to the ear
canal so the sound travels through the air. If the sound is not heard through
the ear, meaning the sound is conducted better through the temporal bone than
through the Formula Focus , a conductive hearing deficit is present. The Weber test
also uses a tuning fork to differentiate between conductive versus
sensorineural hearing loss. In this test, the tuning fork is placed at the top
of the skull, and the sound of the tuning fork reaches both inner ears by
travelling through bone. In a healthy patient, the sound would appear equally
loud in both ears. With unilateral conductive hearing loss, however, the tuning
fork sounds louder in the ear with hearing loss. This is because the sound of
the tuning fork has to compete with background noise coming from the outer ear,
but in conductive hearing loss, the background noise is blocked in the damaged
ear, allowing the tuning fork to sound relatively louder in that ear. With
unilateral sensorineural hearing loss, however, damage to the cochlea or
associated nervous tissue means that the tuning fork sounds quieter in that
ear.
http://www.stressfreebrains.com/formula-focus-nootropic
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