Bayesian brains? 

  Andrew Gelman  has link to a study that just came out in  Nature Neuroscience  whose author, Alex Pouget at the University of Rochester, suggests that "the cortex appears wired at its foundation to run Bayesian computations as efficiently as can be possible."  I haven't read the paper yet, so I don't have much in the way of intelligent commentary, but I'll try to take a look at it soon.  In the meantime, here is a  link  to the press release so you can read something about it even if you don't have access to  Nature Neuroscience .  From the blurb, it sounds pretty neat, especially if you (like me) are at all interested in the psychological plausibility of Bayesian models as applied to human cognition.