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Article

In Time with the Beat: Entrainment in Patients with Phonological Impairment, Apraxia of Speech, and Parkinson’s Disease

1
Clinical Neuropsychology Research Group, Institute of Phonetics and Speech Processing, Ludwig-Maximilians-Universität München, 80799 Munich, Germany
2
International Laboratory for Brain, Music and Sound Research (BRAMS), Département de Linguistique et de Traduction, Université de Montréal, Montréal, QC H3C 3J7, Canada
3
Neolexon, Limedix GmbH, 80538 Munich, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Anja Lowit
Brain Sci. 2021, 11(11), 1524; https://doi.org/10.3390/brainsci11111524
Received: 2 August 2021 / Revised: 8 November 2021 / Accepted: 12 November 2021 / Published: 18 November 2021
(This article belongs to the Special Issue Motor Speech Disorders and Prosody)
In the present study, we investigated if individuals with neurogenic speech sound impairments of three types, Parkinson’s dysarthria, apraxia of speech, and aphasic phonological impairment, accommodate their speech to the natural speech rhythm of an auditory model, and if so, whether the effect is more significant after hearing metrically regular sentences as compared to those with an irregular pattern. This question builds on theories of rhythmic entrainment, assuming that sensorimotor predictions of upcoming events allow humans to synchronize their actions with an external rhythm. To investigate entrainment effects, we conducted a sentence completion task relating participants’ response latencies to the spoken rhythm of the prime heard immediately before. A further research question was if the perceived rhythm interacts with the rhythm of the participants’ own productions, i.e., the trochaic or iambic stress pattern of disyllabic target words. For a control group of healthy speakers, our study revealed evidence for entrainment when trochaic target words were preceded by regularly stressed prime sentences. Persons with Parkinson’s dysarthria showed a pattern similar to that of the healthy individuals. For the patient groups with apraxia of speech and with phonological impairment, considerably longer response latencies with differing patterns were observed. Trochaic target words were initiated with significantly shorter latencies, whereas the metrical regularity of prime sentences had no consistent impact on response latencies and did not interact with the stress pattern of the target words to be produced. The absence of an entrainment in these patients may be explained by the more severe difficulties in initiating speech at all. We discuss the results in terms of clinical implications for diagnostics and therapy in neurogenic speech disorders. View Full-Text
Keywords: apraxia of speech; dysarthria; phonological impairment; perception of rhythm; production of rhythm; auditory cuing; acoustic analysis apraxia of speech; dysarthria; phonological impairment; perception of rhythm; production of rhythm; auditory cuing; acoustic analysis
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MDPI and ACS Style

Aichert, I.; Lehner, K.; Falk, S.; Späth, M.; Franke, M.; Ziegler, W. In Time with the Beat: Entrainment in Patients with Phonological Impairment, Apraxia of Speech, and Parkinson’s Disease. Brain Sci. 2021, 11, 1524. https://doi.org/10.3390/brainsci11111524

AMA Style

Aichert I, Lehner K, Falk S, Späth M, Franke M, Ziegler W. In Time with the Beat: Entrainment in Patients with Phonological Impairment, Apraxia of Speech, and Parkinson’s Disease. Brain Sciences. 2021; 11(11):1524. https://doi.org/10.3390/brainsci11111524

Chicago/Turabian Style

Aichert, Ingrid, Katharina Lehner, Simone Falk, Mona Späth, Mona Franke, and Wolfram Ziegler. 2021. "In Time with the Beat: Entrainment in Patients with Phonological Impairment, Apraxia of Speech, and Parkinson’s Disease" Brain Sciences 11, no. 11: 1524. https://doi.org/10.3390/brainsci11111524

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