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Density, frequency and the expressive phonology of children with phonological delay*

Published online by Cambridge University Press:  19 December 2011

JUDITH A. GIERUT*
Affiliation:
Indiana University, Bloomington
MICHELE L. MORRISETTE
Affiliation:
Indiana University, Bloomington
*
Address for correspondence: Judith A. Gierut, Department of Speech and Hearing Sciences, Indiana University, 200 South Jordan Avenue, Bloomington, IN 47405-7002, USA. e-mail: gierut@indiana.edu

Abstract

The effect of word-level variables on expressive phonology has not been widely studied, although the properties of words likely bear on the emergence of sound structure (Stoel-Gammon, 2011). Eight preschoolers, diagnosed with phonological delay, were assigned to treatment to experimentally induce gains in expressive phonology. Erred sounds were taught using stimulus words that varied orthogonally in neighborhood density and word frequency as the independent variables. Generalization was the dependent variable, defined as production accuracy of treated and untreated (erred) sounds. Blocked comparisons showed that dense neighborhoods triggered greater generalization, but frequency did not have a clear differential effect. Orthogonal comparisons revealed graded effects, with frequent words from dense neighborhoods being optimal for generalization. The results contrast with prior literature, which has reported a sparse neighborhood advantage for children with phonological delay. There is a suggestion that children with phonological delay require greater than usual cue redundancy and convergence to prompt expressive phonological learning.

Type
Articles
Copyright
Copyright © Cambridge University Press 2011

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Footnotes

[*]

This research was supported in part by a grant from the National Institutes of Health (DC01694) to Indiana University. We thank Dan Dinnsen and Jill Hoover for their input, and members of the Learnability Project for their assistance in data management and analysis.

References

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