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A Proposed Neurological Interpretation of Language Evolution
1Department of Communication Sciences and Disorders, Florida International University, Miami, FL 33199, USA.
Behavioural Neurology
|July 1, 2015
Summary
Grammar, linked to Broca's area, likely evolved later than vocabulary. This advanced language system supports complex cognition and metacognitive functions.
Area of Science:
- Neuroscience
- Linguistics
- Evolutionary Biology
Background:
- Aphasia research identifies two main types: Wernicke's (lexical/semantic, temporal lobe) and Broca's (grammatical, frontal-subcortical).
- Language evolution is proposed to have three stages: primitive communication, lexicon-only systems, and grammar-inclusive systems.
Purpose of the Study:
- To propose a model for language evolution, distinguishing between lexical/semantic and grammatical components.
- To investigate the neural basis and evolutionary timeline of grammar acquisition.
Main Methods:
- Review and synthesis of existing literature on aphasia, language evolution, and neurobiology.
- Theoretical modeling of language development stages and their cognitive correlates.
Main Results:
- Grammar, associated with Broca's area and action representation (verbs), is a more recent evolutionary development than the lexical/semantic system (vocabulary).
- Grammar is proposed as foundational for developing metacognitive executive functions.
Conclusions:
- The lexical/semantic system (vocabulary) likely predates Homo sapiens, while grammatical language is a recent acquisition.
- Grammatical language development is intrinsically linked to the evolution of complex cognition and executive functions.
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