Fig 3.

(a) Contextual reshaping of multimodal RFs. Each neuron encodes a stimulus feature (e.g. an odor) that is assumed to elicit a multimodal pattern of sensory activity (upper panels). Neural RFs are measured in the presence of a mask stimulus that activates a small number of nearby receptors. For the three cells shown, recorded RFs undergo complex, non-local changes in the presence of the contextual mask. (b) Reshaping of neural RFs in a simplified network of three neurons, which encode the letters ‘V’, ‘I’, and ‘A’. (c) The RF of a neuron encoding the letter ‘I’ is significantly altered by a contextual stimulus designed to selectively activate one of the other two neurons in the network.