The origin and evolution of neocortex: From early mammals to modern humans.
Level 5 - mechanism / opinion, no new human data
Narrative review of evolutionary neuroanatomy with no primary human experimental data or systematic review methodology (by design analogy, not clinical CEBM).
PubMed 31703909 · doi:10.1016/bs.pbr.2019.03.017
What was done
This narrative review synthesizes comparative neuroanatomical literature to outline the evolutionary trajectory of the neocortex from early ancestral mammals through early primates to modern humans.
What was found
The abstract reports historical and comparative estimates: early mammals had minimal neocortex with roughly 20 cortical areas; early primates evolved around 50 cortical areas; and modern humans have brains that are 80% neocortex with approximately 200 cortical areas, alongside increased network complexity (such as for language) and modular and cellular specializations.
Why it matters
It provides a broad macro-evolutionary framework detailing how progressive cortical arealization and specialization accompanied the development of complex human cognitive capabilities.
Limits
This is a narrative review with no primary empirical data, sample sizes, systematic search strategy, or statistical error margins reported in the abstract. The historical area numbers represent broad expert estimates rather than measured experimental outcomes.
Cited by
- supports Humans have more distinct sensory cortical areas than monkeys and more distant mammalian relatives.