Task-appropriate input supports word-object association in 14-month-old female infants

Area of Science:

• Developmental Psychology
• Infant Language Acquisition
• Speech Perception

Background:

• Fourteen-month-old infants struggle to associate minimal pair nonsense words with new objects.
• Adult speech patterns may influence infant word-object association abilities.

Purpose of the Study:

• To investigate if an adult's speech productions in a word learning context can support minimal pair word-object association in 14-month-old infants.
• To determine if the age of the infant addressed by the adult influences the effectiveness of the adult's speech on word learning.

Main Methods:

• Recorded a mother producing nonsense words ('bin', 'din') while interacting with her 24-month-old and 5-month-old sons.
• Exposed 14-month-old infants to these recorded speech samples.
• Assessed 14-month-old infants' ability to associate the nonsense words with novel objects.

Main Results:

• 14-month-old female infants successfully associated nonsense words with objects when hearing speech produced for the older infant.
• Infants did not show successful word-object association when hearing speech produced for the younger infant.
• The age-appropriateness of the adult's utterances appeared to be a critical factor.

Conclusions:

• Task-appropriateness of adult utterances can significantly support infant word learning.
• Speech directed towards older children may provide a more effective model for younger infants' word acquisition.
• This suggests that the communicative context and perceived audience influence the efficacy of speech in early language development.