Evaluation of Parent-Researcher Agreement on the Vocal Development Landmarks Interview

Area of Science:

• Developmental Psychology
• Speech-Language Pathology

Background:

• Assessing early vocal development is crucial for identifying potential developmental delays.
• Parental input offers a practical method for monitoring vocal behaviors in young children.
• The Vocal Development Landmarks Interview (VDLI) is a tool designed for this purpose.

Purpose of the Study:

• To evaluate the utility of the Vocal Development Landmarks Interview (VDLI) for monitoring vocal behaviors in children aged 6-21 months.
• To compare parent-reported data from the VDLI with researcher assessments of vocal development.
• To determine the reliability and validity of the VDLI as a clinical measure.

Main Methods:

• Parents of 40 typically developing children (6-21 months) completed the VDLI.
• Naturalistic audio recordings of children's vocalizations were collected and analyzed by a trained researcher.
• Parental VDLI responses were compared to researcher's analysis using statistical methods and descriptive exploration of disagreements.

Main Results:

• High overall agreement between parent reports and researcher judgments was observed.
• Significant agreement was found for the Canonical and Word subscales of the VDLI, with notable differences in the Precanonical subscale.
• Researcher-observed vocal behaviors aligned with established developmental trajectories.

Conclusions:

• Parental reports, particularly via the VDLI, are supported as a valid method for assessing early vocal development.
• The VDLI demonstrates utility as a clinical tool for evaluating vocal development in infants and toddlers.
• Further research may explore reasons for disagreement in specific subscales to refine the instrument.