Abstract
This article provides an estimation of how frequently, and from whom, children aged 0-11years (Ns between 9 and 24) receive one-on-one verbal input among Tsimane forager-horticulturalists of lowland Bolivia. Analyses of systematic daytime behavioral observations reveal <1min per daylight hour is spent talking to children younger than 4years of age, which is 4 times less than estimates for others present at the same time and place. Adults provide a majority of the input at 0-3years of age but not afterward. When integrated with previous work, these results reveal large cross-cultural variation in the linguistic experiences provided to young children. Consideration of more diverse human populations is necessary to build generalizable theories of language acquisition.
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