title: Predictors of morphosyntactic growth in typically developing toddlers: contributions of parent input and child sex.
abstract: OBJECTIVE
  Theories of morphosyntactic development must account for between-child differences in morphosyntactic growth rates. This study extends Legate and Yang's (2007) theoretically motivated cross-linguistic approach to determine if variation in properties of parent input accounts for differences in the growth of tense productivity.
  
  
  METHODS
  Fifteen toddlers (and parents) participated. None were producing tense morphemes productively at 21 months. Two dependent measures of morphosyntactic growth between 21 and 30 months were used: empirical Bayes linear coefficients at 21 months and predicted productivity scores at 30 months. Predictor variables included child sex, vocabulary, and mean length of utterance as well as 4 measures of parent language input at 21 months.
  
  
  RESULTS
  Input informativeness for tense was the most consistent predictor of morphosyntactic growth, explaining 28.3% of the unique variance in children's linear growth coefficients at 21 months and 23.0% of the unique variance in predicted tense productivity scores at 30 months. General input measures were unrelated. Child sex explained an additional 24.7% of the variance in early linear growth. Child vocabulary at 21 months did not explain a significant proportion of unique variance.
  
  
  CONCLUSIONS
  The findings provide evidence that input informativeness, an abstract and distributed property of input, contributes to morphosyntactic growth.
authors: University of Illinois at Urbana-Champaign, USA. phadley@illinois.edu
authors: Pamela A
authors: PA
authors: Hadley
authors: Matthew
authors: M
authors: Rispoli
authors: Colleen
authors: C
authors: Fitzgerald
authors: Alison
authors: A
authors: Bahnsen
mesh_terms: D000328:Adult; D002663:Child Language; D016208:Databases, Factual; D005260:Female; D006801:Humans; D007223:Infant; D007804:Language Development; D008037:Linguistics; D008297:Male; D008954:Models, Biological; D010290:Parents; D011237:Predictive Value of Tests; D012044:Regression Analysis; D015203:Reproducibility of Results; D012737:Sex Factors