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Technical Report

Implementation of a fast method for measuring psychophysical tuning curves

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Pages 237-242 | Received 01 Dec 2010, Accepted 21 Dec 2010, Published online: 07 Feb 2011
 

Abstract

Abstract

Objective: To implement a fast method for measuring psychophysical tuning curves (PTCs) for use in clinical applications, such as assessment of frequency selectivity and detection of dead regions in the cochlea. Design: The method is based on that described by Citation and has been implemented in software that can be run on a PC with a good-quality sound card. In addition to the main narrowband noise masker, a lowpass noise masker can be generated to prevent detection of a distortion band corresponding to the simple difference tone. Results: The software includes a routine for measuring the absolute threshold at the signal frequency and includes methods for estimating the frequency at the tip of the PTC. A PTC can typically be determined in about three minutes. A small amount of practice (two to three runs) may be required to achieve stable results. Conclusions: The software implementation allows PTCs to be measured quickly without a requirement for specialised equipment.

Sumario

Objetivo: Implementar un método rápido para medir las curvas psicofisiológicas de sintonía (PTC) para su uso en aplicaciones clínicas tales como la evaluación de la selectividad frecuencial y la detección de zonas muertas de la cóclea. Diseño: El método se basa en la descripción de Citation y ha sido implementado en un software que puede correr en una PC con una buena tarjeta de sonido. Además de tener un enmascarador con ruido de banda ancha principal, se puede generar un enmascarador con ruido pasa-bajo, para prevenir la detección de una banda de distorsión, que corresponde al tono simple de diferencia. Resultados: El software incluye una rutina para medir el umbral absoluto a la frecuencia de la señal e incluye métodos para estimar la frecuencia en la punta de la PTC. Típicamente se puede determinar una PTC en unos tres minutos. Es necesaria un poco de práctica (dos o tres turnos) para lograr resultados estables. Conclusiones: la implementación del software permite medir PTC rápidamente sin requerir equipo especializado.

Acknowledgements

The development of the software was supported by Deafness Research UK and by the MRC (UK).

Declaration of interest: The authors report no declarations of interest.

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