Before revision: A fundamental question in biology is URLanisms integrate sensory and social evidence to make decisions . However, few models describe how both these streams of information can be combined to optimize choices .
After revision: To make decisions we are guided by the evidence we collect, as well as the opinions of friends and neighbors. How do we integrate our private beliefs with information we obtain from our social network? To understand the strategies humans use to do so it is useful to compare them to observers that optimally integrate all evidence .