Thought I'd reply to this for my first post, since I love to study AI books.
IMHO, metaphor plays a big role wrt intelligence and ultimately AI. Just a few non-technical books not to miss. Of course, just because the equations are few doesn't mean that the ideas are small.
Hofstadter - Surfaces and Essences, I am a Strange Loop
In my opinion, at least, metaphor is an important component of thought, and DH brings it home with these two, especially his latest, S&E.
Geary - I is An Other
In the image of Lakoff's work. I haven't actually completed Lakoff's oeuvre, but I did complete this book which gives a summary. Lakoff would be another great author to tackle if you're into analogical AI methods.
Steven Pinker - How the Mind Works, The Language Instinct
Technically not AI books, but certainly about the brain and language, and how the brain creates language. The "instinct" Pinker writes about can be plausibly implemented with a hierarchical structure. So that's interesting.
Domingos - The Master Algorithm
An excellent recent summary of all sub-fields of AI.
Pribram - The Form Within
A little known book about consciousness and the history of neuroscience. The late Pribram believed in a holographic consciousness. Well, what is SDR other than a holographic representation? A hologram distributes memory across the whole storage space. So does an SDR.
McGilchrist - The Master and His Emissary
Another cog-sci book, not so much AI, but an excellent book.
Marcus - The Future of the Brain
A recent summary of where neuroscience / AI research is.