Journal of Speech, Language, and Hearing Research Vol.42 1003-1015 August 1999.
© American Speech-Language-Hearing Association
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Metrical Effects on Speech Movements in Children and Adults

Lisa Goffman 1
Caren Malin 1
1 Purdue University West Lafayette, IN

goffman{at}purdue.edu

The present study investigates motor processes underlying the production of iambic and trochaic metrical forms for children and adults. Lower lip movement was recorded while 16 children between the ages of 3;10 and 4;9 (years; months) and 8 adults produced iambic (e.g., [pép^p]) and trochaic (e.g., ['p^pep]) nonce words. For both children and adults, movement patterns for iambic and trochaic words are well differentiated, but in qualitatively different ways. Most notably, children do not produce amplitude modulated forms for trochees, perhaps reflecting a reliance on early developing rhythmic patterns such as those seen in canonical babbling. In contrast, movements corresponding to iambs are well modulated and particularly stable for both groups of speakers, suggesting that they require increased movement specificity. It appears that metrical forms are perceptually and linguistically established and that the child finds the means available within his or her existent motor repertoire to produce adequately differentiated movements corresponding with iambs and trochees.

KEY WORDS: prosody, stress, phonological acquisition, speech movement, speech motor control

Submitted on June 16, 1998
Accepted on February 26, 1999


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