Figure 1.

(a) The basic perceptron architecture illustrated with six nodes of a signaller (numbered black squares) and six corresponding channels used to convey a message generated by node activity to a receiver (white square numbered 0). (b) Patterns of correlated activity illustrated through connections among signaller nodes. Two sets of three nodes show highly correlated activity: nodes 1–3 are highly correlated and nodes 4–6 are highly correlated. Each correlated cluster is referred to as a modality. (c) Representation of the receiver integrating inputs from the six channels constituting two signalling modalities.