The impact of threat and cognitive stress on speech motor control in people who stutter |
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| Affiliation: | 1. University of Toronto, Speech-Language Pathology, Oral Dynamics Lab (ODL), Canada;2. Department of Psychology, Canada;3. Institute of Biomaterials and Biomedical Engineering, Canada;4. Graduate Department of Rehabilitation Science, Canada;5. Toronto Rehabilitation Institute, Canada;6. Interdisciplinary Center (IDC) Herzliya, School of Psychology, Communication, Aging and Neuropsychology Lab (CANlab), Israel;1. Department of Hearing and Speech Sciences, Vanderbilt University, 1215 21st Avenue South, Room 10221 MCE South Tower, Nashville, TN 37232, United States;2. Department of Psychology and Human Development, Vanderbilt University, Peabody 512, 230 Appleton Place, Nashville, TN 37203, United States;1. Department of Hearing and Speech Sciences, Vanderbilt University, United States;2. Department of Communicative Disorders, University of Alabama, United States;3. Department of Communication Sciences and Disorders, Syracuse University, United States;4. Department of Psychology and Human Development, Vanderbilt University, United States;5. Department of Psychiatry, University of North Carolina at Chapel Hill, United States;1. Department of Hearing and Speech Sciences, Vanderbilt University, 1215 21st Avenue South, Suite 8310 MCE South Tower, Nashville, TN 37232-8242, United States;2. Department of Psychology and Human Development, Peabody College, Vanderbilt University, 230 Appleton Place, Nashville, TN 37203-5721, United States |
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| Abstract: | PurposeIn the present study, an Emotional Stroop and Classical Stroop task were used to separate the effect of threat content and cognitive stress from the phonetic features of words on motor preparation and execution processes.MethodA group of 10 people who stutter (PWS) and 10 matched people who do not stutter (PNS) repeated colour names for threat content words and neutral words, as well as for traditional Stroop stimuli. Data collection included speech acoustics and movement data from upper lip and lower lip using 3D EMA.ResultsPWS in both tasks were slower to respond and showed smaller upper lip movement ranges than PNS. For the Emotional Stroop task only, PWS were found to show larger inter-lip phase differences compared to PNS. General threat words were executed with faster lower lip movements (larger range and shorter duration) in both groups, but only PWS showed a change in upper lip movements. For stutter specific threat words, both groups showed a more variable lip coordination pattern, but only PWS showed a delay in reaction time compared to neutral words. Individual stuttered words showed no effects. Both groups showed a classical Stroop interference effect in reaction time but no changes in motor variables.ConclusionThis study shows differential motor responses in PWS compared to controls for specific threat words. Cognitive stress was not found to affect stuttering individuals differently than controls or that its impact spreads to motor execution processes.Educational objectives: After reading this article, the reader will be able to: (1) discuss the importance of understanding how threat content influences speech motor control in people who stutter and non-stuttering speakers; (2) discuss the need to use tasks like the Emotional Stroop and Regular Stroop to separate phonetic (word-bound) based impact on fluency from other factors in people who stutter; and (3) describe the role of anxiety and cognitive stress on speech motor processes. |
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| Keywords: | Stuttering Anxiety Emotional Stroop Classical Stroop Kinematics |
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