In the first ManyBabies project, we replicated a robust finding from developmental literature: infants’ preference for infant-directed speech (IDS) over adult-directed speech (ADS). IDS is characterized by a higher pitch, greater pitch excursions, and shorter utterances when compared to ADS. Exposure to IDS has been shown to improve word segmentation and word learning. We asked if infants have a preference for IDS, and how this preference varies across age, native language background, and method.

Sixty-nine labs, summing 2,329 infants (range: 3-15 months-old) from 16 countries participated. We focused on three primary methods for assessing infants’ interest: single-screen central fixation, eye tracking, and the head-turn preference procedure (HPP).

We confirmed the existence of an IDS preference in infant listeners. We also found that it increases across development (magnitude of 0.05 SDs per month), suggesting a modulation by experience, maturation, or both. We found a preference for North America English (NAE) IDS even among participants whose native language or dialect was not NAE.


Lastly, we found a stronger effect with the HPP than with the central-fixation or eye-tracking approaches. This engagement might be linked to the greater effort required by HPP.


Leads

Michael Frank and Melanie Soderstrom

Collaborators

For a detailed index of collaborators (+ institutions, countries, studies), check the MB collaborator dashboard:

Status

Completed.

Publications

ManyBabies Consortium (2020). Quantifying sources of variability in infancy research using the infant-directed speech preference. Advances in Methods and Practices in Psychological Science, 3, 24-52. PsyArXiv Preprint


Spin-offs


Secondary Analysis