I’ve spent a lifetime switching my Special Interest every year or two. By now I’m surprisingly knowledgeable in a lot of fields— a skill now obsoleted by AI.
Here's a marvelous paper. It proposes that genetically programmed human language learning doesn't require any genetically specified language mechanism, just a tendency to pay attention to certain stimuli, and to try really hard to predict them. Then generic learning mechanisms can do the hard work. The stimuli to pay attention to are rapid ostensive rhythmical streams of actions. This covers language, and sign language, and also music.
"Noticing language: What echolocation tells us about language emergence" by Brett Reynolds. (Epistemic status: I had this idea a couple of years ago. But I didn't think hard about it or write a paper, so I deserve no credit.)