As I mentioned some time ago , Andrea Scarantino and I wrote a paper on the relationships between information processing, computation, and cognition.  As far as I know, it is the broadest and most systematic discussion of this topic to date.  It also corrects a number of (what we consider) widespread mistakes and includes the most general and (what I consider to be) best formulation of my "mechanistic account" of computation.

The paper is now forthcoming in the Journal of Biological Physics.  If anyone is interested, a preprint may be found here.

Once again, many thanks to all those who provided feedback and encouragement along the way, including many Brains readers.