Sensitivity to discontinuous dependencies in language learners: evidence for limitations in processing space. Santelmann, L. M. & Jusczyk, P. W. Cognition, 69(2):105-34, 1998.
abstract   bibtex   
Five experiments using the Headturn Preference Procedure examined 15- and 18-month-old children's sensitivity to morphosyntactic dependencies in English. In each experiment, the children were exposed to two types of passages. Passages in the experimental condition contained a well-formed English dependency between the auxiliary verb is and a main verb with the ending -ing. Passages in the control condition contained an ungrammatical combination of the modal auxiliary can and a main verb with the ending -ing. In the experiments, the distance between the dependent morphemes was systematically varied by inserting an adverbial of a specified length between the auxiliary and main verbs. The results indicated that 18-month-olds are sensitive to the basic relationship between is and -ing, but that 15-month-olds are not. The 18-month-olds, but not the 15-month-olds, listened significantly longer to the passages with the well-formed English dependency. In addition, the 18-month-olds showed this preference for the well-formed dependency only over a limited domain of 1-3 syllables. Over domains of 4-5 syllables, they showed no significant preference for the experimental over the control passages. These findings indicate that 18-month-olds can track relationships between functor morphemes. Additionally, these findings are consistent with the hypothesis that 18-month-olds are working with a limited processing window, and that they are only picking up relevant dependencies that fall within this window.
@Article{Santelmann1998,
  author   = {L. M. Santelmann and Peter W. Jusczyk},
  journal  = {Cognition},
  title    = {Sensitivity to discontinuous dependencies in language learners: evidence for limitations in processing space.},
  year     = {1998},
  number   = {2},
  pages    = {105-34},
  volume   = {69},
  abstract = {Five experiments using the Headturn Preference Procedure examined
	15- and 18-month-old children's sensitivity to morphosyntactic dependencies
	in English. In each experiment, the children were exposed to two
	types of passages. Passages in the experimental condition contained
	a well-formed English dependency between the auxiliary verb is and
	a main verb with the ending -ing. Passages in the control condition
	contained an ungrammatical combination of the modal auxiliary can
	and a main verb with the ending -ing. In the experiments, the distance
	between the dependent morphemes was systematically varied by inserting
	an adverbial of a specified length between the auxiliary and main
	verbs. The results indicated that 18-month-olds are sensitive to
	the basic relationship between is and -ing, but that 15-month-olds
	are not. The 18-month-olds, but not the 15-month-olds, listened significantly
	longer to the passages with the well-formed English dependency. In
	addition, the 18-month-olds showed this preference for the well-formed
	dependency only over a limited domain of 1-3 syllables. Over domains
	of 4-5 syllables, they showed no significant preference for the experimental
	over the control passages. These findings indicate that 18-month-olds
	can track relationships between functor morphemes. Additionally,
	these findings are consistent with the hypothesis that 18-month-olds
	are working with a limited processing window, and that they are only
	picking up relevant dependencies that fall within this window.},
  keywords = {Attention, Female, Humans, Infant, Language Development, Male, Phonetics, Semantics, Speech Perception, 9894402},
}

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