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Aphasic speech with and without SentenceShaper: Two methods for assessing informativeness.

Ruth B Fink¹, Megan R Bartlett, Jennifer S Lowery

¹Moss Rehabilitation Research Institute, Albert Einstein Healthcare Network, Philadelphia, USA.

|October 11, 2008

Summary

SentenceShaper (SSR) improves speech informativeness for individuals with chronic aphasia. Objective Correct Information Unit (CIU) analysis confirmed that SSR-aided narratives are more informative than unaided speech.

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Area of Science:

Speech-Language Pathology
Neurolinguistics
Assistive Technology

Background:

SentenceShaper (SSR) is a computer-assisted speech program designed to aid sentence and narrative construction.
Previous research indicated that listeners perceive narratives produced with SSR as more informative.
A phenomenon termed 'topic-specific carryover' was observed, where unaided speech improved after using SSR.

Purpose of the Study:

To validate subjective listener judgments of informativeness using objective Correct Information Unit (CIU) analysis.
To assess the effectiveness of CIU analysis in quantifying informativeness differences in aphasic speech.
To further investigate the 'aided effect' of SentenceShaper on narrative informativeness.

Main Methods:

A modified Correct Information Unit (CIU) analysis was applied to speech samples from five individuals with chronic aphasia.
Samples were collected under three conditions: Unaided (U), Aided with SentenceShaper (SSR), and Post-SSR Unaided (Post-U).
Statistical analyses, including bivariate correlations and multiple regression, examined the relationship between CIU measures and listener judgments.

Main Results:

The study confirmed the 'aided effect,' with SentenceShaper-aided (SSR) narratives showing significantly higher % CIUs, often exceeding 90%.
Objective CIU analysis corroborated previous subjective findings regarding the informativeness of SSR-assisted speech.
A strong correlation was observed between CIU measures and listener informativeness ratings.

Conclusions:

The increased % CIUs in SSR-aided samples confirm that SentenceShaper enhances speech informativeness, extending previous findings.
CIU analysis is demonstrated as an effective tool for quantifying informativeness in aphasic speech produced with and without assistive technology.
The results support the utility of SentenceShaper and the validity of CIU analysis in speech-language pathology research.