A kluge is an inelegant solution to a problem, constructed out of the materials at hand, often in a hurry. It isn't the best fix, but it works for now. Many biologists consider the human body a sort of kluge, not perfectly adapted to any one environment, but able to cope in many environments. Author Gary Marcus goes a step further and suggests that the human brain is a kluge and that this explains why we are often irrational, inconsistent, or indecisive.
It's a compelling idea. I've never heard anyone make the argument before, but after reading Kluge, I find myself thinking, well, of course, that's obvious. Marcus presents dozens of examples for his theory, but like linguists contemplating the first human language, we'll never know for sure. Still, there's plenty here to keep you thinking, and it's written in a clear and entertaining style.
As engaging as the kluge theory is, I wasn't entirely convinced. Marcus seems to assume that the perfectly evolved brain would be a computer brain. I'm sure we've all had enough exasperating experiences with computers to find fault with that assumption. And I think Marcus tries to attribute too much to the kluge theory. I can see how making snap decisions or having faulty memory can be blamed on different evolutionary parts of our brain competing with each other, but he is not convincing when blaming our tendency to procrastinate on kluge-y brains.
And yet, the fact that he overreaches CAN be explained by the kluge theory. He discusses, in another context, "our own species' thirst for explanation, which often leads us to build stories out of a sparse set of facts." And he notes "the human tendency to extrapolate excessively from small amounts of highly salient data". Indeed.
The marketing for Kluge seems designed to remind us of Malcolm Gladwell's books. As entertaining as Gladwell (Blink and The Tipping Point) can be, I wouldn't compare Marcus's well-considered arguments to Gladwell's glib observations. For such a short book (fewer than 200 pages), Kluge leaves you with a lot to think about.