It is estimated that approximately 20% of the preschool and school age population demonstrate speech acquisition disorders that are not attributable to an organic cause (NIDCD, 1994). Factors that influence the development of these are not known, but disorders of speech perception, oral-motor control, prosody, and cognitive dysfunction all have received attention as possible etiological determinants. The conclusion from these many research and clinical investigations is that PAD is not likely to have a unitary cause or profile; however, characteristics that differentiate subtypes remain elusive. The primary goal of this research is to provide a multidimensional approach to determining PAD subtypes. A dynamic systems model is being used to drive hypotheses about the factors that influence PAD development. Within this context, the impact of speech perception capabilities, including the ability of young children to extract linguistically relevant information from a variable signal, will be explored. Variations in speech production will be examined with acoustic analysis techniques with the aim of determining how variability and consistency influence speech acquisition and its disorder. Factors to be included in this analysis reflect both spectral and temporal control of articulation. Because this project also is motivated by clinical concerns, diagnostic tools that may help differentiate subtypes of PAD will be evaluated. Treatment protocols will be assessed to determine the relative efficacy of various procedures. The interaction between etiological factors, diagnostic markers and treatment efficacy will be examined, It is expected that this multifaceted approach will prove clinically useful, and at the same time, refine our theories of speech acquisition.

Agency
National Institute of Health (NIH)
Institute
National Institute on Deafness and Other Communication Disorders (NIDCD)
Type
Research Project (R01)
Project #
1R01DC004575-01A2
Application #
6543757
Study Section
Special Emphasis Panel (ZRG1-BBBP-7 (02))
Program Officer
Shekim, Lana O
Project Start
2002-07-01
Project End
2007-06-30
Budget Start
2002-07-01
Budget End
2003-06-30
Support Year
1
Fiscal Year
2002
Total Cost
$213,156
Indirect Cost
Name
Indiana University Bloomington
Department
Other Health Professions
Type
Schools of Arts and Sciences
DUNS #
006046700
City
Bloomington
State
IN
Country
United States
Zip Code
47401
Iuzzini, Jenya; Forrest, Karen (2010) Evaluation of a combined treatment approach for childhood apraxia of speech. Clin Linguist Phon 24:335-45
Forrest, Karen; Iuzzini, Jenya (2008) A comparison of oral motor and production training for children with speech sound disorders. Semin Speech Lang 29:304-11
Forrest, Karen (2003) Diagnostic criteria of developmental apraxia of speech used by clinical speech-language pathologists. Am J Speech Lang Pathol 12:376-80