“pre-print” versions of manuscripts

and serve as pre-prints to work that may live later on, or always exist in their current format

If Kriegeskorte is invited by a journal to write a review, first he decides whether he’s interested enough to review it. If so, he checks whether there’s a preprint available—basically a final draft of the manuscript posted publicly online on one of several preprint servers like arxiv and biorxiv. This is crucial. Writing about a manuscript that he’s received in confidence from a journal editor would break confidentiality—talking about a paper before the authors are ready. If there’s a preprint, great. He reviews the paper, posts to his blog, and also sends the review to the journal editor.