Auditory-motor interactions in pediatric motor speech disorders: neurocomputational modeling of disordered development.
OBJECTIVE
Differentiating the symptom complex due to phonological-level disorders, speech delay and pediatric motor speech disorders is a controversial issue in the field of pediatric speech and language pathology. The present study investigated the developmental interaction between neurological deficits in auditory and motor processes using computational modeling with the DIVA model.


METHODS
In a series of computer simulations, we investigated the effect of a motor processing deficit alone (MPD), and the effect of a motor processing deficit in combination with an auditory processing deficit (MPD+APD) on the trajectory and endpoint of speech motor development in the DIVA model.


RESULTS
Simulation results showed that a motor programming deficit predominantly leads to deterioration on the phonological level (phonemic mappings) when auditory self-monitoring is intact, and on the systemic level (systemic mapping) if auditory self-monitoring is impaired.


CONCLUSIONS
These findings suggest a close relation between quality of auditory self-monitoring and the involvement of phonological vs. motor processes in children with pediatric motor speech disorders. It is suggested that MPD+APD might be involved in typically apraxic speech output disorders and MPD in pediatric motor speech disorders that also have a phonological component. Possibilities to verify these hypotheses using empirical data collected from human subjects are discussed.


OBJECTIVE
The reader will be able to: (1) identify the difficulties in studying disordered speech motor development; (2) describe the differences in speech motor characteristics between SSD and subtype CAS; (3) describe the different types of learning that occur in the sensory-motor system during babbling and early speech acquisition; (4) identify the neural control subsystems involved in speech production; (5) describe the potential role of auditory self-monitoring in developmental speech disorders.
Utrecht Institute of Linguistics OTS, Utrecht University, Trans 10, 3512 JK Utrecht, The Netherlands; Centre for Language and Cognition, Faculty of Arts, University of Groningen, Oude Kijk in 't Jatstraat 26, 9712 EB Groningen, The Netherlands; Medical Psychology/Pediatric Neurology Centre/ENT, Radboud University Nijmegen Medical Centre, Geert Grooteplein-Zuid 10, 6525 GA Nijmegen, The Netherlands. Electronic address: h.r.terband@uu.nl.
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H
Terband
Centre for Language and Cognition, Faculty of Arts, University of Groningen, Oude Kijk in 't Jatstraat 26, 9712 EB Groningen, The Netherlands; Medical Psychology/Pediatric Neurology Centre/ENT, Radboud University Nijmegen Medical Centre, Geert Grooteplein-Zuid 10, 6525 GA Nijmegen, The Netherlands. Electronic address: b.a.m.maassen@rug.nl.
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B
Maassen
Department of Speech, Language, & Hearing Sciences and Biomedical Engineering, Boston University, 677 Beacon Street, Boston, MA 02215, USA; Division of Health Sciences and Technology, Harvard University/Massachusetts Institute of Technology, 77 Massachusetts Avenue, E25-519, Cambridge, MA 02139, USA. Electronic address: fguenth@gmail.com.
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FH
Guenther
Department of Speech, Language, & Hearing Sciences and Biomedical Engineering, Boston University, 677 Beacon Street, Boston, MA 02215, USA. Electronic address: jbrumberg@gmail.com.
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Brumberg
D000162:Acoustics; D000293:Adolescent; D001184:Articulation Disorders / Q000209:etiology* / Q000503:physiopathology; D001307:Auditory Perception / Q000502:physiology; D002657:Child Development / Q000502:physiology; D002663:Child Language; D002675:Child, Preschool; D002658:Developmental Disabilities / Q000150:complications* / Q000503:physiopathology; D006311:Hearing Disorders / Q000150:complications; D006801:Humans; D007223:Infant; D008959:Models, Neurological; D013065:Speech Intelligibility / Q000502:physiology; D013067:Speech Perception / Q000502:physiology; D055815:Young Adult
Computational neural modeling; Developmental speech disorders; Perception-action; Speech motor control; Speech motor development