I would consider this evidence that language predates human vocalizations. We already know deaf children will invent signs and gestures to communicate, and language not dependent on a hyoid bone. Do we have any way of dating the relevant neural structures through genetics?
I think we’d have trouble because we’d have to tie the gene to a specific linguistic cognitive function. My hypothesis is that humans configured themselves into self-replicating group structures I’d call institutions, and language evolved as a way to facilitate that. These institutions exhibit all the thermodynamic properties of life, and they have goal directed behavior independent of individual humans.
FOXP2 was thought to be the genetic basis for language, but this has been overturned[1]. As far as I know there isn't a good candidate for a gene selected for language.
