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A systematic review suggests marked differences in the prevalence of infant-directed vocalization across groups of populations.

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Anthropological reports have long suggested that speaking to young children is very infrequent in certain populations (notably farming ones), which is in line with scattered quantitative studies. A systematic review… Click to show full abstract

Anthropological reports have long suggested that speaking to young children is very infrequent in certain populations (notably farming ones), which is in line with scattered quantitative studies. A systematic review was undertaken to use available literature in order to estimate the extent of population variation. Database searches, expert lists, and citation searches led to the discovery of 29 reports on the frequency of vocalizations directed to infants aged 24 months or younger, based on systematic observations of spontaneous activity in the infant's natural environment lasting at least 30 minutes in length. Together, these studies provide evidence on 1,314 infants growing up in a range of communities (urban, foraging, farming). For populations located outside of North America, the frequency with which vocalization was directed to urban infants was much higher than that for rural infants (including both foraging and farming, medians = 12.6 versus 3.6 percent of observations contained infant-directed vocalization behaviors). We benchmarked this effect against socio-economic status (SES) variation in USA, which was much smaller. Infants in high SES American homes were spoken to only slightly more frequently than those in low SES homes (medians = 16.4 versus 15.1 percent of observations contained infant-directed vocalization behaviors). Although published research represents a biased sample of the world's populations, these results invite further cross-population research to understand the causes and effects of such considerable population group differences. This article is protected by copyright. All rights reserved.

Keywords: review suggests; infant directed; directed vocalization; vocalization; systematic review

Journal Title: Developmental science
Year Published: 2022

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