Assuntos
Audiometria/métodos , Transtornos da Audição/diagnóstico , Testes Auditivos , Fala , Cóclea , Otopatias/diagnóstico , HumanosRESUMO
The use of the worse ear as the fixed-intensity one in the ABLB test has been recommended. This recommendation has been criticised on three grounds. The present work studies these arguments, both theoretically and in light of recent experimental and clinical data, in terms of accuracy of results and of various operational and empirical factors. It is concluded that for achieving each loudness balance it is markedly better to follow the recommendation to keep the worse ear at a fixed intensity and to vary the intensities delivered to the better ear.
Assuntos
Audiometria/métodos , Surdez/diagnóstico , Estimulação Acústica/métodos , Limiar Auditivo , Lateralidade Funcional , HumanosRESUMO
Masking of the non-test ear is often needed in speech audiometry but the methods for such masking have not been well defined. 'White' or 'speech' noise is commonly provided by audiometers for this purpose, and the many problems and uncertainties in their calibration and effectiveness are discussed; data on these aspects are presented with respect to some current audiometers and Fry's and AB(S) PB-word lists. Formulae are given for estimating the possible need for masking, calculating the required dial level of masking noise for a given dial level of speech signal, and assessing the extent to which cross-masking may be affecting the results. The formulae presented are applicable for earphone listening only.
Assuntos
Audiometria/métodos , Fala , Acústica , Humanos , Matemática , RuídoRESUMO
Masking of the non-test ear is frequently required in tone decay, Békésy audiometry and SISI tests; without it, serious misdiagnoses can result. Methods are given for calculating the dial levels of masking noises to be delivered and the extent of possible cross-masking. The methods are subdivided according to whether the tests to be employed are fixed-frequency or sweep-frequency, and to whether masking function data are available from previous use of shadow masking. In difficult cases, careful preliminary shadow-masking procedures and subsequent use of fixed-frequency tests is recommended.
