Infants' detection of the sound patterns of words in fluent speech. Jusczyk, P. W. & Aslin, R. N Cognit Psychol, 29(1):1-23, 1995.
abstract   bibtex   
A series of four experiments examined infants' capacities to detect repeated words in fluent speech. In Experiment 1, 7 1/2-month old American infants were familiarized with two different monosyllabic words and subsequently were presented with passages which either included or did not include the familiar target words embedded in sentences. The infants listened significantly longer to the passages containing the familiar target words than to passages containing unfamiliar words. A comparable experiment with 6-month-olds provided no indication that infants at this age detected the target words in the passages. In Experiment 3, a group of 7 1/2-month-olds was familiarized with two different non-word targets which differed in their initial phonetic segment by only one or two phonetic features from words presented in two of the passages. These infants showed no tendency to listen significantly longer to the passages with the similar sounding words, suggesting that the infants may be matching rather detailed information about the items in the familiarization period to words in the test passages. Finally, Experiment 4 demonstrated that even when the 7 1/2-month-olds were initially familiarized with target words in sentential contexts rather than in isolation, they still showed reliable evidence of recognizing these words during the test phase. Taken together, the results of these studies suggest that some ability to detect words in fluent speech contexts is present by 7 1/2 months of age.
@Article{Jusczyk1995,
  author   = {Peter W. Jusczyk and Richard N Aslin},
  journal  = {Cognit Psychol},
  title    = {Infants' detection of the sound patterns of words in fluent speech.},
  year     = {1995},
  number   = {1},
  pages    = {1-23},
  volume   = {29},
  abstract = {A series of four experiments examined infants' capacities to detect
	repeated words in fluent speech. In Experiment 1, 7 1/2-month old
	American infants were familiarized with two different monosyllabic
	words and subsequently were presented with passages which either
	included or did not include the familiar target words embedded in
	sentences. The infants listened significantly longer to the passages
	containing the familiar target words than to passages containing
	unfamiliar words. A comparable experiment with 6-month-olds provided
	no indication that infants at this age detected the target words
	in the passages. In Experiment 3, a group of 7 1/2-month-olds was
	familiarized with two different non-word targets which differed in
	their initial phonetic segment by only one or two phonetic features
	from words presented in two of the passages. These infants showed
	no tendency to listen significantly longer to the passages with the
	similar sounding words, suggesting that the infants may be matching
	rather detailed information about the items in the familiarization
	period to words in the test passages. Finally, Experiment 4 demonstrated
	that even when the 7 1/2-month-olds were initially familiarized with
	target words in sentential contexts rather than in isolation, they
	still showed reliable evidence of recognizing these words during
	the test phase. Taken together, the results of these studies suggest
	that some ability to detect words in fluent speech contexts is present
	by 7 1/2 months of age.},
  keywords = {Attention, Cognition, Cues, Female, Human, Infant, Language Development, Male, Phonetics, Speech, Support, U.S. Gov't, P.H.S., Newborn, Speech Discrimination Tests, Speech Perception, Child Psychology, Paired-Associate Learning, Psycholinguistics, Acoustic Stimulation, Age Factors, Comparative Study, Contrast Sensitivity, Language, Non-U.S. Gov't, Non-P.H.S., Vocabulary, 7641524},
}

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