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A longitudinal study of infants' early speech production and later letter identification
Farquharson, Kelly Hogan, Tiffany P. Hoffman, Lesa Wang, Jun Green, Kimber F. Green, Jordan R.
Farquharson, Kelly
Hogan, Tiffany P.
Hoffman, Lesa
Wang, Jun
Green, Kimber F.
Green, Jordan R.
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Abstract
Letter identification is an early metric of reading ability that can be reliability tested before a
child can decode words. We test the hypothesis that early speech production will be associated
with children's later letter identification. We examined longitudinal growth in early
speech production in 9 typically developing children across eight occasions, every 3 months
from 9 months to 30 months. At each occasion, participants and their caregivers engaged in
a speech sample in a research lab. This speech sample was transcribed for a variety of
vocalizations, which were then transformed to calculate consonant-vowel ratio. Consonantvowel
ratio is a measure of phonetic complexity in speech production. At the age of 72
months, children's letter knowledge was measured. A multilevel model including fixed quadratic
age change and a random intercept was estimated using letter identification as a predictor
of the growth in early speech production from 9±30 months, measured by the
outcome of consonant-vowel ratio. Results revealed that the relation between early speech
production and letter identification differed over time. For each additional letter that a child
identified, their consonant-vowel ratio at the age of 9 months increased. As such, these
results confirmed our hypothesis: more robust early speech production is associated with
more accurate letter identification.
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2018-10-10
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Public Library of Science
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infants early speech.pdf
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Farquharson K, Hogan TP, Hoffman L,
Wang J, Green KF, Green JR (2018) A longitudinal
study of infants' early speech production and later
letter identification. PLoS ONE 13(10): e0204006.