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Caregiver reports of infant word knowledge often differ from eye-gaze behavior. This study found alignment improved when caregivers reported higher confidence, suggesting methodological changes can enhance infant vocabulary measurement validity.

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MB‐CDIcaregiver reporteye‐gazeinfantslooking‐while‐listeningword recognition

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Area of Science:

  • Developmental Psychology
  • Linguistics
  • Cognitive Science

Background:

  • Assessing infant word knowledge is crucial for understanding language development trajectories.
  • Current methods, caregiver-report and eye-gaze behavior (looking-while-listening tasks), often yield divergent results.
  • The reasons for these misalignments and methods to improve convergent validity require investigation.

Purpose of the Study:

  • To examine methodological factors influencing the alignment between caregiver reports and infant eye-gaze behavior in word comprehension tasks.
  • To identify potential improvements for the measurement validity of infant vocabulary assessment.

Main Methods:

  • Fifty-two American English-learning infants (18-20 months) participated in a looking-while-listening (LWL) task.
  • Infants' eye-gaze behavior was recorded while listening to eight early-acquired words.
  • Caregivers reported their child's knowledge of these words, their confidence, and time spent with the child.

Main Results:

  • Caregivers' reports of word knowledge did not consistently predict infants' eye-gaze behavior.
  • Alignment between measures increased when caregivers reported higher confidence in their responses.
  • Infants' eye-gaze behavior was influenced by caregivers' reports of both target and distractor word labels.

Conclusions:

  • Caregiver confidence is a critical factor for improving the alignment between report and behavioral measures of infant word knowledge.
  • Looking-while-listening tasks may capture infant familiarity with labels for both target and distractor items.
  • Methodological modifications in both caregiver-report and eye-gaze tasks are suggested to enhance the validity of infant vocabulary measurement.