In:How the Brain Got Language – Towards a New Road Map:
Edited by Michael A. Arbib
[Benjamins Current Topics 112] 2020
► pp. 54–69
Plasticity, innateness, and the path to language in the primate brain
Comparing macaque, chimpanzee and human circuitry for visuomotor integration
Published online: 11 August 2020
https://doi.org/10.1075/bct.112.05hec
https://doi.org/10.1075/bct.112.05hec
Abstract
Many researchers consider language to be definitionally unique to humans. However, increasing evidence suggests that language
emerged via a series of adaptations to neural systems supporting earlier capacities for visuomotor integration and manual
action. This paper reviews comparative neuroscience evidence for the evolutionary progression of these adaptations. An
outstanding question is how to mechanistically explain the emergence of new capacities from pre-existing circuitry. One
possibility is that human brains may have undergone selection for greater plasticity, reducing the extent to which brain
organization is hard-wired and increasing the extent to which it is shaped by socially transmitted, learned behaviors.
Mutations that made these new abilities easier or faster to learn would have undergone positive selection, and over time, the
neural changes once associated with individual neural plasticity would tend to become heritable, innate, and fixed. Clearly,
though, language is not entirely “innate;” it does not emerge without the requisite environmental input and experience. Thus,
a mechanistic explanation for the evolution of language must address the inherent trade-off between the evolutionary pressure
for underlying neural systems to be flexible and sensitive to environmental input vs. the tendency over time for continually
adaptive behaviors to become reliably expressed in an early-emerging, canalized, less flexible manner.
Article outline
- Introduction: Comparative neuroscience, exaptation, and language
- LCA-m: Early primate adaptations for the visual control of action
- LCA-c: Hominid dorsal stream adaptations for social transmission of learned skills
- Human-specific adaptations: Integrating cognitive control and action sequencing with high-fidelity representations of action details
- The chicken or the egg: Continuity, divergence, and the environmental context for change in brain-behavior evolution
- Flexibility and environmental sensitivity
- Specificity and innateness
- Toward a new road map
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