Turner, the co-author of Clear and Simple as the Truth, a book I've been touting here, is also the co-author, with linguist George Lakoff, of another book that had a big impact on me, More Than Clear Reason: A Field Guide to Poetic Metaphor. The cognitive psychology base in Clear and Simple rarely comes out explicitly, but it is definitely present behind the scenes. I can find a few places where the authors draw explicitly on the cognitive theory of the mind. For example, when they point to sentences that are difficult to follow because they don't embody the normal patterns of thought. I'd like to ask Turner about this.
And yes, I've checked, it is the same guy.