Theodosius Dobzhansky (1937), Paul Nurse (2020), and many others, propose that evolution is crucial to any understanding of how biology works. Noam Chomsky (2022) proposes that this includes language.

By the proposal here, in this evolution there must have been at least seven steps, the last being the least thoroughly fixated and the most vulnerable to developmental mishap.

This proposal at least reduces any need for postulating specific malformations. Following many others in the same tradition, Lawrence Shriberg et al (2005) call for particular ‘phenotypes’ of disorder. An evolutionary model reverses this, simplifying the theory of disorder. as required in science generally, by an idea generally known as ‘Occam’s razor’ (William of Ockham lived in the 14th century).

In learning to talk there is a lot to learn.