code to replicate results in "Acoustic-lexical characteristics of child-directed speech between 7 and 24 months and their impact on toddlers' phonological processing"
7658LT7mosChild_5_minscoartic.csv - used to run 1_acoustic_results.Rmd; dataframe containing the acoustic measures of coarticulation for all word tokens in each caregiver-child interaction at 7, 10, 18 (where applicable), and 24 months
IPhOD2_Words.csv - the Irvine Phonotactic Online Dictionary, Version 2.0 (Vaden et al., 2009)
acoustic_measures.csv - dataframe generated from 1_acoustic_results.Rmd; contains formant measurements, coarticulation measures, vowel space measurements, phone duration, and word duration from all word tokens in each caregiver-child interaction at 7, 10, 18 (where applicable), and 24 months
child_birthdates_84_public.csv - used to run 2_lexical_results.Rmd; contains children's ages at task completion; public dataframe omits children's birthdates
descrip_vowels.csv.zip - used to run 1_acoustic_results.Rmd; generated by triple formant tracker; contains descriptive information about vowel measurements (vowel identity, surrounding context, time, speaker)
ethnicity_data.csv - used to run 2_lexical_results.Rmd; contains demographic information for children
med_formants.csv - used to run 1_acoustic_results.Rmd; contains formant measurements generated by triple formant tracker triple formant tracker for all peripheral vowels in all word tokens in each caregiver-child interaction at 7, 10, 18 (where applicable), and 24 months
stat.frq.csv - used to run 2_lexical_results.Rmd; dataframe generated from Newman-Ratner corpus via CLAN; contains counts for all word tokens in each caregiver-child interaction at 7, 10, 18 (where applicable), and 24 months
1_acoustic_results.Rmd - process formant measurements and coarticulatory data; compute vowel space area and degree of coarticulation for each caregiver at each time point; required to generate acoustic_measures.csv and run 2_lexical_results.Rmd
2_lexical_results.Rmd - contains code and prose to replicate results section of manuscript, including all tables, figures, and modeling
2_lexical_results.pdf - pdf of results section of manuscript
2_lexical_results_files/figure-latex - directory containing figures generated from 2_lexical_results.pdf
CDS_nonword_public.pdf - complete, compiled manuscript
CDS_nonword_public_supp.pdf - file containing supplementary figures and model summaries
cds_nonword_acoustics.jpg - mediation plot of acoustic predictors (at 10mos) on phonological processing and vocabulary size (at 24mos)
cds_nonword_mediation_10mos.jpg - mediation plot of lexical predictors (at 10mos) on phonological processing and vocabulary size (at 24mos); included in supplementary materials
cds_nonword_mediation_18mos.jpg - mediation plot of lexical predictors (at 18mos) on phonological processing and vocabulary size (at 24mos)
cds_nonword_mediation_7mos.jpg - mediation plot of lexical predictors (at 7mos) on phonological processing and vocabulary size (at 24mos)
Cychosz, M., Edwards, J., Bernstein Ratner, N., Torrington Eaton, C., & Newman, R. (in press). Acoustic-lexical characteristics of child-directed speech between 7 and 24 months and their impact on toddlers' phonological processing. Frontiers in Psychology: Developmental Psychology. (pre-print)
Vaden, K.I., Halpin, H.R., Hickok, G.S. (2009). Irvine Phonotactic Online Dictionary, Version 2.0. [Data file]. Available from http://www.iphod.com.