Abstract
Hearing loss is determined by the diapason change of perceived ear sound frequencies and intensity. Cochlear tonotopicity represents the relationship between stimulation frequency f and place ℓ along the cochlea by the equation of the acoustic-wave hearing model at before-receptors stage ℓ(f) = Lo.22log(f/fmo), where Lo = 32 mm – the cochlear duct length, fmo = 20 kHz – maxima frequency of audible sound. Age-related frequencies standards can be represented by f(t)=fmoe–rt, where r=0.01 year–1 – high-frequency loss factor sound. Using both relations together, we get the length of the cochlear duct for T years LT = Lo.22log(fT/fmo). Destruction of the cochlear duct is exposed apex experiencing cyclical exposure to sound, which represents a decline of frequency fmo. The real length of the cochlear duct LR determined by the same ratio at a frequency fT = fmaxR, established audiometric. Treatment (pharmacological or physical therapy) causes a change in the physical and audiometric properties of inner ear structures. Daily monitoring of the upper frequency sound (fmaxX) determines the effective (useful) the length of the cochlear duct LX. Value LX/LR can be a criterion of treatment effectiveness: LX/LR →1 when the treatment is effective.
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