This is an area that has come up relatively recently in the lab. On evaluating some of our data from an orientation estimation task that we use a lot we found interesting changes in the shapes of error distributions. This increase in kurtosis seems to have some real opportunity to provide some insight into mechanisms of probability effects on attention. We have one recent article in press at Journal of Vision (manuscript copy on this page), and Syaheed Jabar’s master thesis (and the manuscript in preparation) have additional details.