Electroglottography Evidence of Speech Motor Control Problems in Stutterers

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Stuttering is a fluency disorder characterized by core or primary and secondary behaviors. Primary behaviors affect speech production while secondary behaviors affect the movement of people who stutter (PWS). Primary behaviors include involuntary part-word, word, or phrase repetitions which in turn, can lead to silent blocks or pauses as well as sound prolongations. According to Teesson, Packman, & Onslow, 2003, the terms repeated movements and fixed postures fit under primary behaviors; repeated movements pertain to syllables and fixed postures refer to prolongations and pauses (Packman et al., 2007). Secondary behaviors, on the other hand, result from attempts to impede the primary behaviors. They are learned reactions to the core behaviors. To name a few, individuals may exhibit excessive eye blinking, foot taps, facial twitching, jaw tremors, head nods, fist clenching, or table slamming to prevent sound repetitions. They also include avoidance behaviors that occur in anticipation of stuttering. Examples are circumlocution, pauses without struggle, and use of interjections. Again, as Teesson, Packman, & Oslow characterized features of stuttering, the coined term, superfluous behaviors can comprise of “grimacing and grunting reflect[ing] excessive effort” (Packman et al., 2007). Secondary behaviors may work at first and indeed, prevent a sound repetition but over time, it becomes a habit that only accompanies the stuttering, rather than eliminates it. There are typical normal dysfluencies in 2-4 year olds in terms of hesitations, silent pauses, revisions, interjections, and repetitions of words, phrases, and sentences. It becomes atypical dysfluencies when more than 10% of syllables spoken are dysfluent or dysfluencies exceed 2 ... ... middle of paper ... ... phase differences in vocal-fold vibration using synchronous high-speed videoendoscopy and electroglottography. Journal of Voice. 26(6), 816.e13-816.e20. Packman, A., Code, C., & Onslow, M. (2007). On the cause of stuttering: integrating theory with brain and behavioral research. Journal of Neurolinguistics. 20, 353-362. Sebastian, S., Benedict, A.S., & Balraj, A. (2013). Laryngeal movements in stutterers. Journal of Laryngology and Voice. 3(1), 14-17. Weiner, A.E. (1984). Patterns of vocal fold movement during stuttering. Journal of Fluency Disorders. 9, 31-49. Wieneke, G.H., Janssen, E.P., & Brutten, G.J. (2001). Durational variability in the fluent speech of stutterers and nonstutterers. Journal of Fluency Disorders. 26, 43-53. Yaruss, J.S. (2010). Assessing quality of life in stuttering treatment outcomes research. Journal of Fluency Disorders. 35, 190-201.

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