Posted by: Indonesian Children | September 18, 2010

Evidence That a Motor Timing Deficit Is a Factor in the Development of Stuttering

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Evidence That a Motor Timing Deficit Is a Factor in the Development of Stuttering

Journal of Speech, Language, and Hearing Research Vol.53 898-907 August 2010. doi:10.1044/1092-4388(2009/09-0048)
© American Speech-Language-Hearing Association

Lindsey Olander
Anne Smith
Howard N. Zelaznik

Purdue University, West Lafayette, IN

Contact author: Anne Smith, Department of Speech, Language, and Hearing Sciences, Purdue University, 1353 Heavilon Hall, 500 Oval Drive, West Lafayette, IN 47907-2038. E-mail:


To determine whether young children who stutter have a basic motor timing and/or a coordination deficit.


Between-hands coordination and variability of rhythmic motor timing were assessed in 17 children who stutter (4–6 years of age) and 13 age-matched controls. Children clapped in rhythm with a metronome with a 600-ms interbeat interval and then attempted to continue to match this target rate for 32 unpaced claps.


 Children who stutter did not significantly differ from children who were typically developing on mean clapping rate or number of usable trials produced; however, they produced remarkably higher variability levels of interclap interval. Of particular interest was the bimodal distribution of the stuttering children on clapping variability. One subgroup of children who stutter clustered within the normal range, but 60% of the children who stutter exhibited timing variability that was greater than the poorest performing nonstuttering child. Children who stutter were not more variable in measures of coordination between the 2 hands (mean and median phase difference between hands).


We infer that there is a subgroup of young stuttering children who exhibit a nonspeech motor timing deficit, and we discuss this result as it pertains to recovery or persistence of stuttering.

KEY WORDS: stuttering, motor timing, development of stuttering, bimanual motor control, nonspeech task

Supported By

 CHILDREN SPEECH CLINIC Yudhasmara Foundation

 Office ; JL Taman Bendungan Asahan 5 Jakarta Indonesia 10210 

 phone : 62(021) 70081995 – 5703646 email :,  

Clinic and Editor in Chief : Dr WIDODO JUDARWANTO  

phone : 62(021) 70081995 – 62(021) 5703646, mobile : 0817171764

email :  curriculum vitae  


Copyright © 2010, Children Speech Clinic  Information Education Network. All rights reserved


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