Where do ideas come from? This book, published after the author died of brain cancer, tries to figure that out scientifically. While not, strictly speaking, about writing, this review is well done with animated illustrations. It’s a thought-provoking long read.
Leonardo’s Brain: What a Posthumous Brain Scan Six Centuries Later Reveals about the Source of Da Vinci’s Creativity | Brain Pickings
http://www.brainpickings.org/2014/11/17/leonardos-brain-leonard-shlain/
sharon p. lynn 