FluencyBank English IISRP Corpus

Nicoline Ambrose
Hearing and Speech Sciences
University of Illinois


Ehud Yairi
Hearing and Speech Sciences
University of Illinois


Participants: 88 CWS, 40 controls
Type of Study: clinical
Location: USA
Media type: audio
DOI: doi:10.21415/T5KX2D

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Citation information

Users of this corpus should the following publication:

For a full bibliography, please click here.

Project Description

This corpus includes: The general objective of the Illinois International Stuttering Research Project is to study the onset and subsequent developmental course of stuttering in children under age six. The specific objectives are to:

The general investigation involves a wide range of testing of young children as close as possible to the onset of stuttering. This includes tests of speech, language, hearing, motor skills, intellectual functioning, and emotional reactions, as well as audio and video recordings, thorough case histories, and familial pedigrees. After initial testing we proceed with follow-ups every six months for a period of several years. Through this close monitoring, we document what happens to children who begin stuttering and generate criteria for risks. The National Institutes of Health, National Institute on Deafness and Other Communication Disorders funded this project for more than 12 years.

For a full list of researchers involved in this project, click here


Stuttering-like disfluencies are coded as:

"Normal"-like disfluencies are coded as:

Here are two examples:

(block)I wa-wa-waaaaant w-want some um um cookies cookies

[DP]I [DP][PW3][WW1]want some [I2] [M1]cookies.

Ca-ca-can I play play play so-so-some some of those toys?



Andrew Yankes reformatted this corpus into accord with current versions of CHAT.