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A systematic review suggests marked differences in the prevalence of infant-directed vocalization across groups of populations
Developmental Science ( IF 3.1 ) Pub Date : 2022-04-16 , DOI: 10.1111/desc.13265
Alejandrina Cristia 1
Affiliation  

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 min in length. Together, these studies provide evidence on 1314 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 vs. 3.6% of observations contained infant-directed vocalization behaviors). We benchmarked this effect against socio-economic status (SES) variation in the United States, 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 vs. 15.1% 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.

中文翻译:

一项系统评价表明,不同人群中针对婴儿发声的流行率存在显着差异

长期以来,人类学报告表明,在某些人群(尤其是农业人群)中,与幼儿交谈的频率非常低,这与分散的定量研究一致。进行了系统审查以使用现有文献来估计人口变异的程度。根据对婴儿在自然环境中持续至少 30 分钟的自发活动的系统观察,数据库搜索、专家列表和引文搜索导致发现 29 份关于针对 24 个月或更小婴儿的发声频率的报告。这些研究共同提供了 1314 名婴儿在一系列社区(城市、觅食、农业)中成长的证据。对于北美以外的人群,针对城市婴儿发声的频率远高于针对农村婴儿的发声频率(包括觅食和耕作,中位数 = 12.6,而 3.6% 的观察结果包含针对婴儿的发声行为)。我们将这种影响与美国的社会经济地位 (SES) 差异进行了比较,后者要小得多。高 SES 美国家庭的婴儿与低 SES 家庭的婴儿交谈的频率仅略高于低 SES 家庭的婴儿(中位数 = 16.4 对 15.1% 的观察包含针对婴儿的发声行为)。尽管已发表的研究代表了世界人口的一个有偏见的样本,但这些结果需要进一步的跨人口研究,以了解如此巨大的人口群体差异的原因和影响。
更新日期:2022-04-16
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