The Perception of Rhythmic Units in Speech by Infants and Adults. Echols, C., Crowhurst, M., & Childers, J. Journal of Memory and Language, 36(2):202-225, 1997. abstract bibtex Three studies investigated the perception of rhythmic units in speech to explore the potential role of rhythm in word-level segmentation. Experiment 1 investigated whether adults expect trochaic (strong-weak) units to cohere. The prediction that poststress pauses, which violated the coherence of the trochee, would be unexpected and therefore more noticeable was supported: Subjects were consistently more likely to identify post- than prestress pauses in trisyllabic speech stimuli. In Experiment 2, a variant of a head-turn preference procedure was used to test a similar question with 7- and 9-month-old infants. Nine-month olds showed a significant preference for stimuli in which the coherence of the trochee was preserved, suggesting that they perceived those stimuli as more natural than stimuli in which trochaic sequences were disrupted by pauses. Among 7-month olds, no preferences were observed. A third experiment tested the possibility that 9-month olds use the trochaic stress pattern in word-level segmentation. Subjects distinguished a trochaic sequence that had previously been embedded in a four-syllable string from a novel trochaic sequence, suggesting that they recognized the previously heard trochaic unit as familiar. No such discrimination was present for iambic targets and distracters, suggesting that infants failed to recognize the previously heard iambic sequence.
@Article{Echols1997,
author = {Echols, C.H. and Crowhurst, M.J. and Childers, J.B.},
journal = {Journal of Memory and Language},
title = {The Perception of Rhythmic Units in Speech by Infants and Adults},
year = {1997},
number = {2},
pages = {202-225},
volume = {36},
abstract = {<P> Three studies investigated the perception of rhythmic units in
speech to explore the potential role of rhythm in word-level segmentation.
Experiment 1 investigated whether adults expect trochaic (strong-weak)
units to cohere. The prediction that poststress pauses, which violated
the coherence of the trochee, would be unexpected and therefore more
noticeable was supported: Subjects were consistently more likely
to identify post- than prestress pauses in trisyllabic speech stimuli.
In Experiment 2, a variant of a head-turn preference procedure was
used to test a similar question with 7- and 9-month-old infants.
Nine-month olds showed a significant preference for stimuli in which
the coherence of the trochee was preserved, suggesting that they
perceived those stimuli as more natural than stimuli in which trochaic
sequences were disrupted by pauses. Among 7-month olds, no preferences
were observed. A third experiment tested the possibility that 9-month
olds use the trochaic stress pattern in word-level segmentation.
Subjects distinguished a trochaic sequence that had previously been
embedded in a four-syllable string from a novel trochaic sequence,
suggesting that they recognized the previously heard trochaic unit
as familiar. No such discrimination was present for iambic targets
and distracters, suggesting that infants failed to recognize the
previously heard iambic sequence.</P>},
}
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