Reliability of the American English matrix test
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Type of Workapplication/pdf
ix, 60 pages
DepartmentTowson University. Department of Audiology, Speech-Language Pathology and Deaf Studies
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The current study assessed the list equivalency of six lists from the American English Matrix test as well as training effects when using this test with an adaptive speech stimulus and a fixed speech stimulus. Twenty (N=20) participants (5 males, 15 females) with normal hearing were included in this study. Repeated-measures ANOVA results showed the six test lists were equivalent; in other words, the speech reception threshold (SRT) scores from the participants were comparable. Repeated-measures ANOVA results between the three fixed signal-to-noise ratios (SNRs) used in the fixed speech stimulus condition, -6 dB SNR, -8.5 dB SNR and -11 dB SNR, showed significant differences in scores. More specifically, when the fixed SNRs increased in difficulty, the participants' scores decreased. However, the participants' scores were higher than the predicted intelligibility scores of 80%, 50%, and 20%, respectively. Repeated-measures ANOVA results within each session and between sessions showed an increase in SRT scores indicating strong training effects. Further research is needed to determine if gender effects as well as ear effects impact the scores for each list. It is recommended that future studies use lists that do not contain duplicate sentences, in order to truly look at list equivalency and training effects. Following the collection of the data with normal hearing individuals, further research should be conducted to determine how individuals with varying degrees of hearing loss, as well as varying ages, perform on the American English Matrix test.