Predicting visual function is possible by interpreting a wiring diagram

The matrix PAB is the fraction of inputs synapses to cell type B that come from cell type A. For a given cell, we define ‘is connected to input type t’ as meaning that the cell receives at least one connection from some cell of type t. Similarly, the attribute ‘is connected to output type t’ means that the cell makes at least one connection onto some cell of type t.