title: Phrasal prosody constrains syntactic analysis in toddlers.
abstract: This study examined whether phrasal prosody can impact toddlers' syntactic analysis. French noun-verb homophones were used to create locally ambiguous test sentences (e.g., using the homophone as a noun: [le bébésouris] [a bien mangé] - [the baby mouse] [ate well] or using it as a verb: [le bébé] [sourità sa maman] - [the baby] [smiles to his mother], where brackets indicate prosodic phrase boundaries). Although both sentences start with the same words (le-bebe-/suʁi/), they can be disambiguated by the prosodic boundary that either directly precedes the critical word /suʁi/ when it is a verb, or directly follows it when it is a noun. Across two experiments using an intermodal preferential looking procedure, 28-month-olds (Exp. 1 and 2) and 20-month-olds (Exp. 2) listened to the beginnings of these test sentences while watching two images displayed side-by-side on a TV-screen: one associated with the noun interpretation of the ambiguous word (e.g., a mouse) and the other with the verb interpretation (e.g., a baby smiling). The results show that upon hearing the first words of these sentences, toddlers were able to correctly exploit prosodic information to access the syntactic structure of sentences, which in turn helped them to determine the syntactic category of the ambiguous word and to correctly identify its intended meaning: participants switched their eye-gaze toward the correct image based on the prosodic condition in which they heard the ambiguous target word. This provides evidence that during the first steps of language acquisition, toddlers are already able to exploit the prosodic structure of sentences to recover their syntactic structure and predict the syntactic category of upcoming words, an ability which would be extremely useful to discover the meaning of novel words.
authors.affiliation: Laboratoire de Sciences Cognitives et Psycholinguistique, DEC-ENS/EHESS/CNRS, Ecole normale supérieure - PSL Research University, Paris, France; Maternité Port-Royal, AP-HP, Faculté de Médecine Paris Descartes, France. Electronic address: x.de.carvalho@gmail.com.
authors.forename: Alex
authors.initials: A
authors.lastname: de Carvalho
authors.affiliation: School of Philosophy, Psychology and Language Sciences, University of Edinburgh, Edinburgh, United Kingdom.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Dautriche
authors.affiliation: Department of Linguistics, University of California, Los Angeles, USA.
authors.forename: Isabelle
authors.initials: I
authors.lastname: Lin
authors.affiliation: Laboratoire de Sciences Cognitives et Psycholinguistique, DEC-ENS/EHESS/CNRS, Ecole normale supérieure - PSL Research University, Paris, France; Maternité Port-Royal, AP-HP, Faculté de Médecine Paris Descartes, France.
authors.forename: Anne
authors.initials: A
authors.lastname: Christophe
mesh_terms: D002675:Child, Preschool; D005260:Female; D006801:Humans; D007223:Infant; D007804:Language Development; D008297:Male; D010700:Phonetics; D013061:Speech Acoustics; D013067:Speech Perception
keywords: Eye movements; Infants speech perception; Language acquisition; Parsing; Phrasal prosody; Sentence processing; Syntactic ambiguity resolution