Auditory plasticity has been noticed by success of cochlear implant surgery. Since patients with acquired deafness who lost hearing absolutely on the way of life, can hear voice, environmental sounds and understand conversation again, we wonder how their brain mechanism changes biologically.
No auditory stimuli climb up central auditoy pathway in patients with complete loss of hearing. Then, probably, neurons or synapses must be modified from aspects of biochemistry, pharmacology, physiology and morphology. Neurons or synapses may be reorganized after cochlear implant surgery, again. As long as we observe patients with cochlear implant, successful conditions of recovery of hearing seem to be younger ages or shorter periods of loss of hearing and normal psychology at the time of surgery.
In this review, items of background which are related to auditory development, plasticity and regeneration are described. For example, development of hearing and language of congenital and acquired deafness in children, unilateral or bilateral hearing aid fittings, hearing aid in elderly peoples and central auditory processing in central auditory disorders are discussed.
Auditory plasticity is an important and interesting field for research in basic and clinical medicine.
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