Evidence for Infant-directed Speech Preference Is Consistent Across Large-scale, Multi-site Replication and...

Area of Science:

• Developmental Psychology
• Linguistics
• Cognitive Science

Background:

• Infants consistently prefer infant-directed speech (IDS) over adult-directed speech (ADS).
• Evidence primarily stems from meta-analyses and multi-lab replication studies.

Purpose of the Study:

• To compare two large-scale investigations on infant-directed speech preference.
• To examine the boundary conditions of infant speech preference by analyzing population and design characteristics.
• To integrate findings from a meta-analysis and a multi-lab replication study.

Main Methods:

• Combined and compared data from a community-augmented meta-analysis and a large-scale multi-lab replication study.
• Analyzed key population (infant age, native language) and design (experimental methods) characteristics.
• Utilized statistical models to assess effect sizes and moderator influences.

Main Results:

• Both the meta-analysis and multi-lab replication yielded moderate effect sizes (d ≈ 0.35) for IDS preference.
• The IDS preference remained robust across various experimental methods, infant ages, and native languages in both analyses.
• Divergent findings emerged regarding moderator effects: infant age and experimental method influenced IDS preference in the multi-lab study but not the meta-analysis.

Conclusions:

• Infant-directed speech preference is a generalizable phenomenon across diverse conditions.
• Comparing meta-analyses and multi-lab replications reveals both consensus and discrepancies in understanding developmental phenomena.
• Further research is needed to clarify the influence of specific moderators on infant speech preference.