@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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