That’s exactly how we apply things to our long-term memory. When we attach it to things we already know. Putting new ideas and information into our own words and own understanding of it allows it to ingrain itself into our memory. I find this especially true when you‘re excited to read the book and you‘re totally immersed in it, which is kind of like an emotion since it resonates with us enough for us to become immersed.

I don‘t know if what you‘re describing has more to do with neuroplasticity or if it‘s a real thing. I know smells can greatly impact the way we remember things. I can say that’s true from the studies out there and my own experiences but that’s getting a bit deep into it haha.