Connected Speech Test (CST)
The CST comprises speech materials that can be used to quantify the intelligibility of connected speech. There is no standardized method for administering these materials, nor for interpreting the results of the CST. Rather, these materials can be applied according to the user's objective. The user is encouraged to consult the references given about the development and administration of the test and reliability of data from normal-hearing and hearing-impaired listeners.
Briefly, the talker is a female who produces speech of average intelligibility. The multi-talker babble can be adjusted to simulate the signal to babble ratio (SBR) encountered in everyday listening situations. Each test item is a passage of speech, 9 or 10 sentences in length, about a familiar topic. The listener should be informed of the passage topic. Each passage is presented one sentence at a time. The passage score is based on the proportion of 25 scoring words correctly repeated. Scores typically are averaged across several test passages to produce a measure of intelligibility for a particular listening situation.
Obtaining the CST
Note: The CST is available in 2 formats: on the HARL Speech Intelligibility Tests Audio CD and on a DVD. The Audio CD incudes only the audio part of the CST. Software is available for purchase that can assist with administration and scoring of the Audio CD. The DVD contains both the Audio and Visual parts of the CST. There is no available software to assist with administration and scoring of the DVD.
Format: Audio Compact Disc
Cost: $50 (US) per CD
Software to administer and score the audio CD:
This software administers and scores the audio CD version of the CST. In order to use the software for scoring/administration of the CST you must have the CST audio CD and a CD drive on your computer. It will not work with the DVD version.
The CST administration program can be purchased from the AUSP Software Group at the School of Communication Sciences and Disorders at the University of Memphis.
Cost: $30 (US)
Tip: Once the software has been installed, remove the setup disk from the CD drive and insert the HARL Speech Intelligibility Tests audio CD during testing.
Cost: $50 (US) per DVD
Instructions for Purchasing CST Materials:
All CST CD and DVD purchases must be prepaid.
To order by mail send a written request with payment or purchase order to:
Your order will be passed on to the appropriate individual for processing. Make check or purchase order payable to "The University of Memphis". Prices include shipping.
These tests were developed at the Hearing Aid Research Laboratory of The University of Memphis with primary support from the Department of Veterans Affairs Rehabilitation Research and Development Service. Support was also provided by the Center for Research Initiatives and Strategies for the Communicatively Impaired (CRISCI), The University of Memphis.
References: Information about the development and research regarding the CST may be found in:
Cox, R.M., Alexander, G.C., Gilmore, C. and Pusakulich, K.M. "The Connected Speech Test Version 3: Audiovisual Administration". Ear and Hearing, 10(1), 29-32 (1989).
Cox, R.M., Alexander, G.C., Gilmore, C. and Pusakulich, K.M. "Use of the Connected Speech Test (CST) with Hearing-Impaired Listeners". Ear and Hearing, 9(4), 198-207 (1988).
Cox, R.M., Alexander, G.C. and Gilmore, C.A. "Development of the connected speech test (CST)." Ear and Hearing, 8 (supplement): 119S-126S (1987).