Executive functions and stuttering severity in Persian adults

Abstract

Introduction: Fluent speech requires executive functions for identification, inhibition, and modification of speech interruptions to continuously regulate the speech process. The current study examined the executive functions in adults who stutter (AWS) and adults who do not stutter (AWNS). We also examined the relationship between executive functions and stuttering severity. Materials and methods: This research is a descriptive-analytic cross-sectional study. The participants included 32 AWS (mean age = 28 years; SD = 6.79 years) who were divided into three groups of mild, moderate, and severe severity and 32 AWNS (mean age = 28.57 years; SD = 6.53 years; 28). Selected tests from Delis-Kaplan executive function system (D-KEFS) were used to assess executive function domains. Results: The results of this study showed that AWS performed significantly lower than AWNS in working memory (p = 0.009), problem solving and planning (p < 0.001), verbal cognitive flexibility (shifting) (p < 0.001), and verbal inhibitory control (p < 0.001). The results also showed no difference between AWS and AWNS in non-verbal inhibition, shifting, and reasoning. Furthermore, there was a significant relationship between stuttering severity and executive function domains. Conclusion: Together, this study showed that executive function skills are affected in AWS and should be considered in the rehabilitation programs of AWS.

Keywords

• Executive function, developmental stuttering, severity, adult, D-KEFS test