I think a lot of Piaget's work has either been built on or pushed back on in more recent research, so while it definitely could be a good place to start I would

I think a lot of Piaget's work has either been built on or pushed back on in more recent research, so while it definitely could be a good place to start I would make sure you also look into some more modern work. The other benefit of that is you can also reach out with questions, at least I've generally had good luck with getting responses from PIs. Laura Schulz is a super nice person who may have work of interest to you GP.