However, it remains unclear whether the spread of excitation is the only cause of the observation, or whether other factors such as temporal interaction also contribute to it. Previous studies have found that the spectral resolution reduces with increasing distance of the stimulation electrode from the auditory nerve fibers (ANFs), attributable to increasing current spread. The potential factors of this observation include current spread, nerve survival, and CI mapping. However, despite its usefulness for predicting speech perception outcomes, SRD performance exhibits large across-subject variabilities even among subjects implanted with the same CIs and sound processors. Nystagmus.Spectral ripple discrimination (SRD) has been widely used to evaluate the spectral resolution in cochlear implant (CI) recipients based on its strong correlation with speech perception performance. Indian Journal of Otolaryngology and Head & Neck Surgery. National Institutes of Health.īisht M, Bist S. National Institute of Neurological Disorders and Stroke. What is Ménière's disease?: diagnosis and treatment. National Institute on Deafness and Other Communication Disorders. Vestibular neuritis: symptoms, causes, diagnosis & treatment. Purves D, Augustine G, Fitzpatrick D et al. Review of congenital inner ear abnormalities on CT temporal bone. Neuroanatomy: cranial nerve 8 (vestibulocochlear). Though many medications can potentially trigger it, it’s most often associated with certain types of antibiotics, as well as some chemotherapy drugs. Ototoxicity: An unintended side effect of some drugs, otoxicity is characterized by hearing loss (when it affects the cochlear nerve) and severe dizziness (when it strikes the vestibular nerve).This condition is either due to an autoimmune disorder or as a result of viral infections, such as the West Nile and Zika. Symptoms are severe and include high fever, movement disorders, neck stiffness, sound and light sensitivity, and many others. Encephalitis: An inflammation of the brain tissues, encephalitis can cause serious dysfunction in the vestibular system.Some believe this condition arises due to autoimmune disorders or previous viral infections, while others speculate it has to do with constrictions in blood supply. Ménière's disease: Excessive fluid buildup in the labyrinth, of which the vestibular apparatus is a part, can result in severe vertigo, dizziness, tinnitus (ringing in the ears), and hearing loss.Exact causes of this condition are unknown however, it may be linked to viral infections, such as chickenpox, shingles, measles, hepatitis, and polio, among others. Vestibular neuritis: Inflammation of the vestibulocochlear nerve can lead to the onset of this condition, characterized by severe vertigo, spinning, dizziness, loss of balance, nausea, and vomiting.Nystagmus: This is a disorder of ocular motion, in which eye movements are jerky and unsteady they may be slow in one direction, but fast in the opposite direction and tend to “jump.” This may lead to problems with vision and dizziness.
0 kommentar(er)
