Journal of Speech, Language, and Hearing Research Vol.55 879-891 June 2012. doi:10.1044/1092-4388(2011/11-0123)
© American Speech-Language-Hearing Association
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Research Note

Psychometric Functions for Shortened Administrations of a Speech Recognition Approach Using Tri-Word Presentations and Phonemic Scoring

Stanley A. Gelfanda,,b
Jessica T. Gelfandc
a Queens College, Flushing, NY
b The Graduate Center, City University of New York
c Touro College, New York, NY

Correspondence to Stanley A. Gelfand: stanley.gelfand{at}qc.cuny.edu

Method: Complete psychometric functions for phoneme and word recognition scores at 8 signal-to-noise ratios from –15 dB to 20 dB were generated for the first 10, 20, and 25, as well as all 50, three-word presentations of the Tri-Word or Computer Assisted Speech Recognition Assessment (CASRA) Test (Gelfand, 1998) based on the results of 12 normal-hearing young adult participants from the original study.

Results: The psychometric functions for both phoneme and word scores were very similar and essentially overlapping for all set sizes. Performance on the shortened tests accounted for 98.8% to 99.5% of the full (50-set) test variance with phoneme scoring, and 95.8% to 99.2% of the full test variance with word scoring. Shortening the tests accounted for little if any of the variance in the slopes of the functions.

Conclusions: The psychometric functions for abbreviated versions of the Tri-Word speech recognition test using 10, 20, and 25 presentation sets were described and are comparable to those of the original 50-presentation approach for both phoneme and word scoring in healthy, normal-hearing, young adult participants.

KEY WORDS: phonemic scoring, reliability, speech recognition, tri-word testing, word scoring


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