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Assessment of Intelligibility of Dysarthric Speech (AIDS)
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NeuroRehab Supplemental - Highly Recommended
Recommendations for Use: Indicated for studies requiring a measure of speech. Recommended for Friedreich's Ataxia; Any Disease/Condition in which a participant is suspected of having motor speech impairment or exhibits reduced intelligibility.
Supplemental: Friedreich's Ataxia (FA)
Short Description of Instrument
The Assessment of Intelligibility of Dysarthric Speech (AIDS) is a tool for qualifying single word intelligibility, sentence intelligibility, and speaking rate of adult and adolescent speakers with dysarthria.
Comments/Special Instructions
NeuroRehab Specific:
Widely used measure of word and sentence-level intelligibility across types of dysarthria and severity levels. Predictability of sentences can influence intelligibility rating (Beverly et al., 2010).
Scoring and Psychometric Properties
Scoring: After an examiner has given the assessment, which is recorded, at least one judge scores the participant's intelligibility based on the following parameters:
  • Intelligible words/ total number of words
  • Percentage of judges' responses correct
Rate of Intelligible Speech
  • Intelligible words / total duration
Speaking Rate
  • Total number of words/duration of sample
  • Examiner averages the scores between judges
  • Total number of words scored intelligible by the judges/ total number of words (50)
Communication Efficiency Ratio
  • IWPM/190IWPM
Rate of Unintelligible Speech
  • Unintelligible words/ duration
Psychometric Properties: Intra-judge reliability was assessed via Pearson product-moment correlations with results indicating r-values of .99 for sentence intelligibility and .98 for intelligible words per minute (IWPM). Intra-speaker reliability was similarly assessed with r-values of .94 for sentence intelligibility and .99 for IWPM (Yorkston and Beukelman, 1980).
Strengths: The AIDS assessment can monitor progress and give an index of severity of individuals with dysarthria.
Weaknesses: No demographic information is provided in the AIDS manual regarding the participants used to determine intra- and inter-judge reliability, nor does the manual provide norming data (Gurevich and Scamihorn, 2017).
Key Reference:
Yorkston KM, Beukelman DR. Assessment of Intelligibility of Dysarthric Speech. Austin, TX: Pro-Ed; 1984.
Additional References:
Beverly D, Cannito M, Chorna L, Wolf T, Suiter D, Bene ER. Influence of stimulus sentence characteristics on speech intelligibility scores in hypokinetic dysarthria. J Med Speech Lang Pathol. 2010;18(4): 9-13.
Folker J, Murdoch B, Cahill L, Delatycki M, Corben L, Vogel A. Dysarthria in Friedreich's ataxia: a perceptual analysis. Folia Phoniatr Logop. 2010;62(3):97-103.
Gurevich N, Scamihorn SL. Speech-Language Pathologists' Use of Intelligibility Measures in Adults With Dysarthria. Am J Speech Lang Pathol. 2017 Aug 15;26(3):873-892.
Sheard C, Adams RD, Davis PJ. Reliability and agreement of ratings of ataxic dysarthric speech samples with varying intelligibility. J Speech Hear Res. 1991 Apr;34(2):285-93.
Singh A, Epstein E, Myers LM, Farmer JM, Lynch DR. Clinical measures of dysarthria in Friedreich Ataxia. Mov Disord. 2010 Jan 15;25(1):108-11.
Stipancic KL, Tjaden K, Wilding G. Comparison of Intelligibility Measures for Adults With Parkinson's Disease, Adults With Multiple Sclerosis, and Healthy Controls. J Speech Lang Hear Res. 2016 Apr 1;59(2):230-8. Erratum in: J Speech Lang Hear Res. 2018 Sep 19;61(9):2215.
Stipancic KL, Yunusova Y, Berry JD, Green JR. Minimally Detectable Change and Minimal Clinically Important Difference of a Decline in Sentence Intelligibility and Speaking Rate for Individuals With Amyotrophic Lateral Sclerosis. J Speech Lang Hear Res. 2018 Nov 8;61(11):2757-2771.
Yorkston KM, Beukelman DR. A clinician-judged technique for quantifying dysarthric speech based on single-word intelligibility. J Commun Disord. 1980 Jan;13(1):15-31.
Document last updated June 2024