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Planum temporale asymmetry in newborn monkeys predicts the future development of gestural communication’s handedness
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Planum temporale asymmetry in newborn monkeys predicts the future development of gestural communication’s handedness
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Journal Article
Planum temporale asymmetry in newborn monkeys predicts the future development of gestural communication’s handedness
2024
Overview
The planum temporale (
PT
), a key language area, is specialized in the left hemisphere in prelinguistic infants and considered as a marker of the pre-wired language-ready brain. However, studies have reported a similar structural
PT
left-asymmetry not only in various adult non-human primates, but also in newborn baboons. Its shared functional links with language are not fully understood. Here we demonstrate using previously obtained MRI data that early detection of
PT
left-asymmetry among 27 newborn baboons (
Papio anubis
, age range of 4 days to 2 months) predicts the future development of right-hand preference for communicative gestures but not for non-communicative actions. Specifically, only newborns with a larger left-than-right
PT
were more likely to develop a right-handed communication once juvenile, a contralateral brain-gesture link which is maintained in a group of 70 mature baboons. This finding suggests that early
PT
asymmetry may be a common inherited prewiring of the primate brain for the ontogeny of ancient lateralised properties shared between monkey gesture and human language.
The planum temporale is a key structure in the human language network. Here the authors show that planum temporale asymmetry at birth in baboons predicts the development of communicative right-hand use, which suggests some common features in the wiring of communicative properties between species.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
