answer:E.O. Wilson’s Consilience (1997) is a trip. It’s a pan across the fields of evolutionary biology, neuroscience and genetics and introduces such topics as “epigenetics” and “epiculture”. The chapter on the mind is particularly useful for establishing how and why individuals relate to culture. Anyway, that’s a suggestion for the hard science aspect. From a writer’s handbook standpoint, both of the following have good reviews and you can find them on Amazon: Characters and Viewpoint (Elements of Fiction Writing) by Orson Scott Card (1999) Creating Unforgettable Characters by Linda Seger (1990) Yet another suggestion is to get your hands on a manual of psychiatric disorders or neuroses. The show Boston Legal is such a draw, in part, because each of the characters has a bizarre and prominent neurosis… and, as in this show, quirks and neuroses are best used as leverage to expose the strengths and weaknesses of both characters and society in writing.