Deficits in auditory processing are an assumed underlying mechanism in stuttering. Previous studies have demonstrated that speech evoked auditory brainstem response (s-ABR) is a reliable method to evaluate brainstem timing in clinical popula- tions with persistent developmental stuttering (PDS). The examination of s-ABR signals to quantify differential complexi - ties between PDS and normal subjects using linear analysis is unreliable. This prompted us to evaluate non-linear methods, which are more effective for conveying complex dynamics. The aim of the current study is to apply fractal dimension and the Hurst exponent to s-ABR signals in order to identify complexity differences between PDS and normal subjects who were stimulated with the synthetic/da/stimulus. Analysis of scaling exponents showed a statistically significant difference between the two groups. The s-ABR signal in subjects with stuttering becomes more complex due to stimulation. These findings are discussed in terms of dysfunctional sub-cortical activation in PDS populations. Keywords Speech evoked auditory brainstem response (s-ABR) · Persistent developmental stuttering (PDS) · Fractal dimension · Hurst exponent · Complexity 1 Introduction has been demonstrated in the subcortical regions and the auditory and motor areas related to stuttering [8, 9]. Mag- Stuttering is a speech dysfluency characterized by inter - netoencephalography (MEG) and imaging
Journal of Medical and Biological Engineering – Springer Journals
Published: Jun 1, 2018
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