For lack of a breakthrough in the field, there have been numerous debates about what kind of natural phenomenon language might be. Some researchers focus on the innate aspects of language. It is suggested that grammar has emerged adaptationally from the human genome, bringing about a language instinct;[6] or that it depends on a single mutation[7] which has caused a language organ to appear in the human brain.[8] This is hypothesized to result in a crystalline[9] grammatical structure underlying all human languages. Others suggest language is not crystallized, but fluid and ever-changing.[10] Others, yet, liken languages to living organisms.[11] Languages are considered analogous to a parasite[12] or populations of mind-viruses. There is so far little scientific evidence for any of these claims, and some of them have been labelled as pseudoscience.[13][14]
^Gontier, Nathalie (2012). "Selectionist approaches in evolutionary linguistics: an epistemological analysis". International Studies in the Philosophy of Science. 26 (1): 67–95. doi:10.1080/02698595.2012.653114. hdl:10451/45246. S2CID121742473.
^McMahon, April; McMahon, Robert (2012). Evolutionary Linguistics. Cambridge University Press. ISBN978-0521891394.
^Croft, William (1993). "Functional-typological theory in its historical and intellectual context". STUF - Language Typology and Universals. 46 (1–4): 15–26. doi:10.1524/stuf.1993.46.14.15. S2CID170296028.
^Gibson, Kathleen R.; Tallerman, Maggie, eds. (2011). The Oxford Handbook of Language Evolution. Oxford University Press. ISBN9780199541119.
^Berwick, Robert C.; Chomsky, Noam (2015). Why Only Us: Language and Evolution. MIT Press. ISBN9780262034241.
^Anderson, Stephen R.; Lightfoot, David W. (2003). The Language Organ: Linguistics as Cognitive Psychology. Cambridge University Press. ISBN9780521007832.
^Chomsky, Noam (2015). The Minimalist Program. 20th Anniversary Edition. MIT Press. ISBN978-0-262-52734-7.
^Bybee, Joan L.; Beckner, Clay (2015). "Usage-Based theory". In Heine, Bernd; Narrog, Heiko (eds.). The Oxford Handbook of Linguistic Analysis. Oxford University Press. pp. 953–980. doi:10.1093/oxfordhb/9780199544004.013.0032. ISBN978-0199544004.
^van Driem, George (2005). "The language organism: the Leiden theory of language evolution". In Minett, James W.; Wang, William S.-Y. (eds.). Language Acquisition, Change and Emergence: Essays in Evolutionary Linguistics. pp. 331–340.
^Schwarz-Friesel, Monika (2012). "On the status of external evidence in the theories of cognitive linguistics". Language Sciences. 34 (6): 656–664. doi:10.1016/j.langsci.2012.04.007.
^Polichak, James W. (2002). "Memes as pseudoscience". In Shermer, Michael (ed.). The Skeptic Encyclopedia of Pseudoscience, Vol. 1. ABC Clio. pp. 664–667. ISBN1-57607-653-9.