Language complexity - https://en.wikipedia.org/wiki/Language_complexity
Evidence reveals that the language of thought is not natural language - https://medicalxpress.com/news/2026-07-evidence-reveals-lang...
Complexity trade-offs and equi-complexity in natural languages: a meta-analysis - https://pmc.ncbi.nlm.nih.gov/articles/PMC10234276/
Language as a mechanism for reasoning about possibilities - https://pmc.ncbi.nlm.nih.gov/articles/PMC9620752/