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The precision of 12-month-old infants' link between language and categorization predicts vocabulary size at 12 and 18 months.

Ferguson B, Havy M, Waxman SR - Front Psychol (2015)

Bottom Line: We found that, at 12 months, infants who had already established a precise link between labels and categories understood more words than those whose link was still broad.We conclude that individual differences in the precision of 12-month-old infants' links between language and categories provide a reliable window into their vocabulary development.We consider several causal explanations of this relation.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, Northwestern University, Evanston, IL USA.

ABSTRACT
Infants' initially broad links between language and object categories are increasingly tuned, becoming more precise by the end of their first year. In a longitudinal study, we asked whether individual differences in the precision of infants' links at 12 months of age are related to vocabulary development. We found that, at 12 months, infants who had already established a precise link between labels and categories understood more words than those whose link was still broad. Six months later, this advantage held: At 18 months, infants who had demonstrated a precise link at 12 months knew and produced more words than did infants who had demonstrated a broad link at 12 months. We conclude that individual differences in the precision of 12-month-old infants' links between language and categories provide a reliable window into their vocabulary development. We consider several causal explanations of this relation.

No MeSH data available.


Infants’ novelty preference scores and total receptive vocabulary counts on the MCDI at 12 months. The color of each point indicates whether this infant was classified as having a “broad” link between language and categories (because they showed a novelty preference at test) or a “precise” link between language and categories (because they failed to show a novelty preference at test).
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Figure 2: Infants’ novelty preference scores and total receptive vocabulary counts on the MCDI at 12 months. The color of each point indicates whether this infant was classified as having a “broad” link between language and categories (because they showed a novelty preference at test) or a “precise” link between language and categories (because they failed to show a novelty preference at test).

Mentions: We then assigned infants to one of two groups, based on their performance at test (see Figure 2). Infants demonstrating a novelty preference were assigned to the broad link (N = 14) group. Infants demonstrating chance (0.5) or familiarity preferences were assigned to the precise link (N = 10) group2. Because these two groups were unbalanced and heterogeneous in variance, we performed Welch’s t-tests for all group comparisons.


The precision of 12-month-old infants' link between language and categorization predicts vocabulary size at 12 and 18 months.

Ferguson B, Havy M, Waxman SR - Front Psychol (2015)

Infants’ novelty preference scores and total receptive vocabulary counts on the MCDI at 12 months. The color of each point indicates whether this infant was classified as having a “broad” link between language and categories (because they showed a novelty preference at test) or a “precise” link between language and categories (because they failed to show a novelty preference at test).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4553367&req=5

Figure 2: Infants’ novelty preference scores and total receptive vocabulary counts on the MCDI at 12 months. The color of each point indicates whether this infant was classified as having a “broad” link between language and categories (because they showed a novelty preference at test) or a “precise” link between language and categories (because they failed to show a novelty preference at test).
Mentions: We then assigned infants to one of two groups, based on their performance at test (see Figure 2). Infants demonstrating a novelty preference were assigned to the broad link (N = 14) group. Infants demonstrating chance (0.5) or familiarity preferences were assigned to the precise link (N = 10) group2. Because these two groups were unbalanced and heterogeneous in variance, we performed Welch’s t-tests for all group comparisons.

Bottom Line: We found that, at 12 months, infants who had already established a precise link between labels and categories understood more words than those whose link was still broad.We conclude that individual differences in the precision of 12-month-old infants' links between language and categories provide a reliable window into their vocabulary development.We consider several causal explanations of this relation.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, Northwestern University, Evanston, IL USA.

ABSTRACT
Infants' initially broad links between language and object categories are increasingly tuned, becoming more precise by the end of their first year. In a longitudinal study, we asked whether individual differences in the precision of infants' links at 12 months of age are related to vocabulary development. We found that, at 12 months, infants who had already established a precise link between labels and categories understood more words than those whose link was still broad. Six months later, this advantage held: At 18 months, infants who had demonstrated a precise link at 12 months knew and produced more words than did infants who had demonstrated a broad link at 12 months. We conclude that individual differences in the precision of 12-month-old infants' links between language and categories provide a reliable window into their vocabulary development. We consider several causal explanations of this relation.

No MeSH data available.