Language, Speech, and Hearing Services in Schools Vol.27 215-230 July 1996.
© American Speech-Language-Hearing Association

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Phonological Treatment Efficacy and Developmental Norms

Judith A. Gierut 1
Michele L. Morrisette 1
Mary T. Hughes 1

Susan Rowland 1

1 Indiana University, Bloomington

The efficacy of teaching sounds in developmental sequence as defined by age norms was evaluated in two independent investigations. Study I was a within-subject evaluation using an alternating treatments design, with three children each receiving treatment on one early-acquired and one later-acquired phoneme relative to chronological age. Study II was an across-subject evaluation involving six children in a staggered multiple baseline paradigm, whereby three subjects were each taught one early-acquired sound and three other subjects were taught one later-acquired sound relative to chronological age. Phonological change was measured on probes of sounds excluded from each child's phonemic inventory.

General results indicated that: (a) quantitatively, change in treated phonemes and manner classes was equivocal following treatment of early-acquired and later-acquired phonemes; (b) qualitatively, the onset of change was immediate following treatment of later-acquired phonemes, but delayed following treatment of early-acquired phonemes; and (c) treatment of later-acquired phonemes led to system-wide changes in untreated sound classes, whereas treatment of early-acquired phonemes did not. These findings were considered relative to clinical intervention and theories of phonological acquisition.

KEY WORDS: phonological disorders, phonological treatment, treatment efficacy, developmental norms

Submitted on August 10, 1994
Accepted on July 11, 1995


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