Flint-Knapping as a Path To Human Speech

I like this argument:

Kolodny’s arguments build off the groundbreaking experiments of Dietrich Stout, an anthropologist at Emory University. A flintknapper himself, Stout has taught hundreds of students how to make Acheulean-era tools, and he’s tracked their brain activity during the learning process. Stout found that his students’ white matter—or the neural connectivity in their brains—increased as they gained competence in flintknapping. His research suggests that producing complex tools spurred an increase in brain size and other aspects of hominin evolution, including—perhaps—the emergence of language.

But language couldn’t just pop out fully formed, like Athena from the head of Zeus. “Every evolutionary process, including the evolution of language, has to be incremental and composed of small steps, each of which independently needs to be beneficial,” Kolodny explains. Teaching, he says, was a crucial part of the process. When hominins like Homo ergaster and Homo erectus taught their close relatives how to make complex tools, they worked their way into an ever more specialized cultural niche, with evolutionary advantage going to those individuals who were not only adept at making and using complex tools, but who were also able—at the same time—to communicate in more and more sophisticated ways.