By E. de Boer, W. Connor, H. Davis, J.J. Eggermont, R. Galambos, C.D. Geisler, G.M. Gerken, H.E. von Gierke, C.S. Hallpike, E.Jr. Hawkins, S.A. Hillyard, W.D. Keidel, D.E. Parker, T.W. Picton, W. Rudmose, F.B. Simmons, G. Stange, C.R. Steele, J. Tonndorf, M.
after heated and sometimes sour debates, SIEBENMANN'S opinion eventually prevailed, i. e. , a contribution to cochlear lesions because of vibrations of the ground transmitted through bone conduction couldn't be proven. For something, it was once tough to work out how considerable quantities of strength may perhaps achieve the ears during this demeanour, contemplating the attenuation that's certain to take place throughout all of the many joints alongside the pathway concerned. In a few older audiological surveys carried out in (e. g. , TEMKIN, 1933), teams of workmen have been came across who displayed symptoms of apical-turn lesions, i. e. , low-tone listening to losses for air and for bone. Such lesions couldn't be anticipated to effects from publicity to air-borne sounds due to the low-frequency attenu ation of the center ear. even though WITTMAACK'S rationalization, which was once often invoked in such stories, does not seem tenable, such apical-turn lesions may well conceivably be attributable to bone conduction elements of high-intensity noise within the experience of BEKESY (1948). - so far as i'm conscious of, no more moderen stories were performed during this challenge quarter, and the older experiments and/or surveys have been performed now and then ahead of sign parameters can be accurately managed or measured. an in depth, serious evaluation of the older reports at the power contribution of bone-conducted strength to commercial listening to loss and its underlying pathology might be present in Werner (1940) who, incidently, favourite SIEBENMANN'S aspect of VIew.
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Laryng. ) 35, 411-422 (1947). : Loudness recruitment. Trans. Amer. oto!. Soc. 53, 85-93 (1965). : On the semeiological value of the loudness discomfort leve!. Int. Audio!. 8, 164-171 (1969). DE BRU'iNE-ALTES, J. : The symptom of regression in different kinds of deafness. Doctoral Thesis Groningen. Groningen: WoltE'rs 1946. , DIX, M. , HALLl'IKE, C. , HOOD, J. : A recent clinico-pathological study of cochlear nerve degeneration resulting from tumor pressure and disseminated sclerosis, with particular reference to the finding of normal threshold sensitivity for pure tones.
O'/. 40 I- / / Curves for normal C r itical level Curve B -Words _ for words - - - Cur ve A Sentences ---- 20 I 0 20 30 10 Amplif ication , Db t I 40 t 50 t I 60 70 I I 80 Conve rsation (Loud) Conversahon (Ordinary at 3 Ft ) Church level Fig. 28. Speech audiogram. See text I 90 100 Speech Audiometry 29 intensities. Curves A and B show the results obtained in normal subjects. The words used for the word lists were monosyllables and have a consonant-vowelconsonant structure. Words of this kind vary in their "intrinsic intelligibility".
It is in this respect that the phenomenon has some, although indirect, clinical significance. Bone conduction and industrial hearing los8 - WITTMAACK (1917), who had been interested in the problem of noise-induced cochlear lesions for some years, made the suggestion, on the basis of animal experiments with histological follow-up controls, that vibrations of the floor produced by noisc-generating machinery might contribute to cochlear damage. Such vibratory energy was thought to reach the ears by transmission via the feet and the entire body.