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Original Article

Modified binaural pitch-matching test for the assessment of diplacusis: Prueba binaural modificada de equiparacion de tonos para la evaluacion de la diploacusia

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Pages 297-302 | Received 11 Feb 2002, Accepted 13 Aug 2002, Published online: 07 Jul 2009
 

Abstract

Diplacusis is defined as the phenomenon of hearing the same tone at different pitches in the two ears. Although binaural pitch-matching using method-of-adjustment has been employed in most studies, it is sometimes hard for subjects with impaired hearing to judge ‘equal pitch’ as one frequency. To resolve this problem, a modified pitch-matching test, in which the relation of pitch sensation between the two ears was assessed as a matched frequency ‘range’ using the randomized maximum likelihood sequential procedure, was developed. Eight subjects with unilaterally impaired hearing, as well as eight normal subjects, were examined to evaluate this new test procedure. In the present method, matched frequency is assessed as a frequency range, in which subjects cannot judge whether the pitch of the signal in one ear is higher or lower than that in the opposite ear. This method appeared to be useful for assessing the characteristics of diplacusis in subjects with impaired hearing as well as in normal subjects.

Sumario

La diploacusia se define como el fenómeno de percibir un mismo tono como frecuencias diferentes en los dos oídos. Aunque se ha utilizado en muchos estudios la equiparación binaural del tono por el método del ajuste, a veces es difícil que los sujetos con trastornos auditivos juzguen un “tono igual” como una misma frecuencia. Para solucionar este problema, se desarrolló una prueba modificada de equiparación de tonos, en la cuál la relación de sensación tonal entre los dos oídos se evaluó como un rango de frecuencias, utilizando procedimientos secuenciales aleatorios de máxima similitud. Se examinaron ocho sujetos con hipoacusia unilateral y ocho con audición normal para evaluar este nuevo procedimiento. Con este método, la equiparación de la frecuencia se evalúa como un rango de frecuencias, en el que los sujetos no pueden juzgar si el tono de la señal en un oído es más alto o más bajo que en el oído opuesto. Este método parece ser útil para evaluarlas características de la diploacusia en sujetos con trastornos auditivos, así como en sujetos normales.

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