A New Method for the Clinical Determination of Sensorineural Acuity Level (SAL)

Threshold shift validity by documenting sensorineural acuity level: a useful tool for masking

“…Further, this shift in patient is compared with normative shift with the computation of sensorineural acuity level threshold using the formulae given by Jerger and Tillman which states that predicted sensorineural loss as the difference between the amount of threshold shift produced by the noise in that patient and the threshold shift produced by the same noise in normal listeners. 5,8,9,14 In stage 1 of this study, normative shift was calculated as shown in (Table 2). Pertinent precautions were taken during its administration.…”

“…Greater Shifts were obtained at higher frequencies than at lower frequencies which indicates that bone conducted noise can mask the tone more efficiently for higher frequencies resembling the results obtained by Jerger, Tillman and Richard Dohohoo in their studies. [7][8][9] The probable justification noted till date reveals the role of occlusion effect, nature of ambient noise and availability of maximum level of bone conducted noise for occurrence of such phenomenon. [7][8][9] Occlusion effect is defined as the enhancement or increase in loudness of bone conducted tone during pure tone audiometry.…”

“…Later, the normal threshold shifts were obtained by comparing the air conducted masked thresholds with unmasked air conducted threshold obtained through conventional approach which completed the first stage of research. 4,5,[7][8][9]10 For 2 nd stage, patients with sensorineural hearing were included with following criteria.…”

“…2,7 It aids in identifying Sensorineural component by comparing threshold shifts in patient with threshold shifts in normal individuals. 5,8 Although SAL requires simple procedure and fewer requirements, there is paucity in its use due to some reasons like unavailability of normative with respect to Indian context, occlusion effect and availability of a few studies related to SAL test. 7,9 An effort is made in this article to understand, document normative of SAL test and to check the validity of these normative.…”

Aeromedical Evaluation for Space Pilots

“…The bone conduction threshold results for these same listeners are reported in Tables V and VI. The minor differences between AC and BC thresholds can be primarily attributed to error of measurement and calibration deviation (7,15). One candidate showed evidence of a mild conductive impairment in one ear.…”