The purpose of this research project was to determine the existence and type of sequential effect evident in ratings of voice quality by SLPs with and without prior experience rating voices using the CAPE-V overall severity rating. It was expected that SLPs with experience rating voices will demonstrate a small assimilation bias and those without experience rating voices will demonstrate a larger contrast bias. A between-groups method was used where each participant rated moderately dysphonic voices in a neutral, severe, and mild condition. The severe and mild conditions were composed of 5 severely or mildly dysphonic voices after which the moderate voice was rated again to assess any change in rating by condition. All participants demonstrated a contrast bias in the severe condition only. Raters without experience rating voices had a larger contrast bias, as well as those with greater confidence using the CAPE-V tool. The results of this study suggest caution in using a clustered presentation of voices for research purposes as the contrast bias observed would impact the validity of those observations. Knowledge of this effect should be incorporated into future studies of voice ratings.
| Identifer | oai:union.ndltd.org:bu.edu/oai:open.bu.edu:2144/44463 |
| Date | 19 May 2022 |
| Creators | Lee, Shannon |
| Contributors | Stepp, Cara E. |
| Source Sets | Boston University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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