Nature Neuroscience 9, 468–470 (2006); corrected after print 9 June 2006

In the version of this article originally published, the abstract contained an error. The abstract should read “A Bayesian model of visual motion perception describes how the brain combines assumption with evidence. A new study in this issue tests and expands the model, building connections between perception, the environment and neural responses.” The error has been corrected in the HTML and PDF versions of the article.