Abstract
This study established test-retest reliability and critical differences for an implementation of the coordinate response measure (CRM) for the purpose of detecting significant changes in task performance. In normal-hearing adults, speech stimuli were presented monaurally at 50 dB sound pressure level in speech-shaped noise at signal-to-noise ratios (SNRs) of -12, -9, and -6 dB. Two runs were obtained. Intrasubject and intersubject variability were examined. Performance increased significantly with increasing SNR and in the second run. High variability was observed at each SNR. Critical differences indicated that only large changes in performance would be significant for the CRM as implemented in this study.
Highlights
The coordinate response measure (CRM; Bolia et al, 2000) is a closed-set speech discrimination task
The current study was motivated by our recent work (Mertes et al, 2019) that utilized the CRM to investigate how activation of the contralateral medial olivocochlear (MOC) reflex contributes to speech-in-noise performance
Post hoc testing revealed a mean increase of 31.125 rationalized arcsine units (RAU) [95% confidence interval (CI), 27.914 to 34.336, p < 0.005] from –12 to –9 dB signal-to-noise ratios (SNRs), a mean increase of 28.693 RAU [95% CI, 24.549 to 32.838, p < 0.005] from –9 to –6 dB SNR, and a mean increase of 59.819 RAU [95% CI, 55.704 to 63.933, p < 0.005] from –12 to –6 dB SNR
Summary
The coordinate response measure (CRM; Bolia et al, 2000) is a closed-set speech discrimination task. It consists of a corpus of sentences spoken by male and female adult speakers of American English. The listener’s task is to correctly identify the color-number combination produced by a target talker, typically in the presence of noise. Some participants showed higher scores in the presence of the elicitor, but we did not establish test-retest reliability and critical differences so we could not determine if these changes in score represented true changes due to contralateral MOC reflex activity or if the changes fell within test-retest variability. The testretest reliability and critical differences are relevant for applications such as detecting significant decreases in score due to progression of hearing loss or detecting significant increases in score due to an intervention
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