Tracing the evolutionary trajectory of verbal working memory with neuro-archaeology
We used optical neuroimaging to explore the extent of functional overlap between working memory (WM) networks involved in
language and Early Stone Age toolmaking behaviors. Oldowan tool production activates two verbal WM areas, but the functions of
these areas are indistinguishable from general auditory WM, suggesting that the first hominin toolmakers relied on early
precursors of verbal WM to make simple flake tools. Early Acheulian toolmaking elicits activity in a region bordering on
Broca’s area that is involved in both visual and verbal WM tasks. The sensorimotor and mirror neurons in this area, along with
enhancement of general WM capabilities around 1.8 million years ago, may have provided the scaffolding upon which a WM network
dedicated to processing exclusively linguistic information could evolve. In the road map going forward, neuro-archaeologists
should investigate the trajectory of WM over the course of human evolution to better understand its contribution to language
origins.
Article outline
- Introduction
- Neuro-archaeological insights into the evolution of working memory
- Working memory centers activated during stone tool production
- Discussion
- Towards a new road map
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Acknowledgements
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References