hi there today we're looking at back propagation in the brain by Timothy Lilly corrupt Adam Santoro Luke Morris Colin Ackerman and Geoffrey Hinton so this is a bit of an unusual paper for the machine learning community but nevertheless it's interesting and let's be honest at least half of our interest comes from the fact that Geoffrey Hinton is one of the authors of this paper so this is a paper that basically proposes a hypothesis on how the algorithm of back propagation works in the brain because previously there has been a lot