Diagnostic Precision of Open-Set Versus Closed-Set Word Recognition Testing

Tzu Ling J. Yu, Robert S. Schlauch

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: The aim of the study was to examine the precision of forced-choice (closed-set) and open-ended (open-set)word recognition (WR) tasks for identifying a change inhearing.Method: WR performance for closed-set (4 and 6 choices)and open-set tasks was obtained from 70 listeners withnormal hearing. Speech recognition was degraded bypresenting monosyllabic words in noise (−8, −4, 0, and 4signal-to-noise ratios) or processed by a sine wave vocoder(2, 4, 6, and 8 channels).Results: The 2 degraded speech understanding conditionsyielded similarly shaped, monotonically increasing psychometricfunctions with the closed-set tasks having shallower slopesand higher scores than the open-set task for the samelistening condition. Fitted psychometric functions to theaverage data were the input to a computer simulationconducted to assess the ability of each task to identify achange in hearing. Individual data were also analyzed using95% confidence intervals for significant changes in scoresfor words and phonemes. These analyses found thefollowing for the most to least efficient condition: open-set(phoneme), open-set (word), closed-set (6 choices), andclosed-set (4 choices).Conclusions: Closed-set WR testing has distinct advantagesfor implementation, but its poorer precision for identifying achange than open-set WR testing must be considered.

Original languageEnglish (US)
Pages (from-to)2035-2047
Number of pages13
JournalJournal of Speech, Language, and Hearing Research
Volume62
Issue number6
DOIs
StatePublished - Jun 2019

Bibliographical note

Funding Information:
This project is part of a doctoral dissertation directed by the second author that was funded by the Department of Speech-Language-Hearing Sciences, the Bryng Bryngelson Research Award, a Doctoral Dissertation Fellowship awarded by the University of Minnesota, and a Governmental Research Scholarship for Students Studying Abroad from the Ministry of Education in Taiwan. We thank Edward Carney for programming advice, Sydney Murray and Sarah Rosen for scoring assistance, Andy Byrne for technical support, and the Center for Applied & Translational Sensory Science at the University of Minnesota for equipment and laboratory space.

Funding Information:
This project is part of a doctoral dissertation directed by the second author that was funded by the Department of Speech-Language-Hearing Sciences, the Bryng Bryngelson Research Award,a Doctoral Dissertation Fellowship awarded by the University ofMinnesota, and a Governmental Research Scholarship for StudentsStudying Abroad from the Ministry of Education in Taiwan. Wethank Edward Carney for programming advice, Sydney Murrayand Sarah Rosen for scoring assistance, Andy Byrne for technicalsupport, and the Center for Applied & Translational Sensory Scienceat the University of Minnesota for equipment and laboratory space

Publisher Copyright:
© 2019 American Speech-Language-Hearing Association. All rights reserved.

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