Infant vocal category exploration as a foundation for speech development
Fig 1
Clustering across ages: The figure shows means of statistically significant clustering for recordings from infants at each of 6 age intervals.
Values were computed at the infant level, such that all recordings for any infant within the age intervals indicated were averaged first, and 95% bootstrapped confidence intervals displayed as error bars were computed based on the averages for the number of infants who had recordings within those age intervals. a. Growls showed significant clustering for more than 30% of the infants at all ages. b. Squeals showed significant clustering for more than 30% of infants at all ages except the 3–4-month interval, where 27% of infants had significant clustering of squeals. c. In the final panel we display the proportion of infants who showed either significant growl or squeal clustering at each of the age intervals. From 48% to 69% of infants showed significant clustering of either growls or squeals at the various age intervals, and all the age intervals beyond 5 months revealed more than 60% of infants had significant clustering.
