Expressive timing in infant-directed singing between 3 and 6 months

Area of Science:

• Developmental Psychology
• Infant Communication
• Music Cognition

Background:

• Infant-directed (ID) singing is crucial for preverbal communication.
• Changes in ID singing characteristics during early infancy are not well-documented.
• Musical interactions, or 'period of games,' become significant between 3 and 6 months.

Purpose of the Study:

• To investigate changes in maternal singing's expressive timing between 3 and 6 months postpartum.
• To determine if mothers adapt singing tempo and timing based on infant attention and involvement.
• To explore how maternal singing adapts to infant age and sex.

Main Methods:

• Longitudinal study of 18 mother-infant dyads.
• Mothers sang a French playsong to their infants at 3 and 6 months.
• Acoustic analyses focused on expressive timing, tempo, and structural unit marking.

Main Results:

• Mothers exhibited final-lengthening and tempo slowing in singing at both 3 and 6 months.
• Mothers more saliently marked song's structural units for 6-month-olds compared to 3-month-olds.
• Singing to infant girls featured more exaggerated phrase-lengthening than singing to boys.

Conclusions:

• Maternal singing timing adapts to infant developmental stage, particularly in marking song structure.
• Expressive timing in maternal singing shows sensitivity to infant age and sex.
• These findings highlight the dynamic nature of parent-infant musical communication.