In:
The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 27, No. 5_Supplement ( 1955-09-01), p. 1012-1012
Abstract:
Studies were performed comparing various audiometric methods applicable to groups composed of men whose losses might range from 0 to 90 db. Interrupted tones and a 2-db-step attenuator were employed throughout. First, the following methods were compared, using enlisted Naval personnel: (1) simple intensity descent (S merely presses button “when beeps disappear”); (2) direct adjustment of attenuator by S (to “just barely heard”); (3) indirect adjustment (key controlling motor-drive of attenuator); (4) direct adjustment, but with alternate pulses separated by 6 db (in order to give S a “criterion”); (5) indirect adjustment with the 6-db difference in level. No important differences in reliability were found. Therefore, simple intensity descent is to be preferred, being independent of individual differences in adjustment time as well as requiring the least apparatus. Accordingly, a second study was run comparing different conditions of descent (pulse rates of 1.5 and 2.25 pps, rates of decline of 3 and 1.5 db/sec). Again there were no important differences in reliability, all conditions giving a mean standard deviation of about 1.5 db. Furthermore, there is good evidence that the thresholds thus obtained are fully as valid as the results of “standard” clinical audiometry. This work was supported by Office of Naval Research Contract No. Nonr-1151 and performed in collaboration with the U. S. Naval School of Aviation Medicine, Pensacola, Florida.
Type of Medium:
Online Resource
ISSN:
0001-4966
,
1520-8524
Language:
English
Publisher:
Acoustical Society of America (ASA)
Publication Date:
1955
detail.hit.zdb_id:
1461063-2
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