We are interested in how cells in the visual system process information. Previous emphasis in the lab was on the parallel processing of different kinds of visual information: form, color, depth, and movement. We discovered an interdigitating and highly specific connectivity between functionally distinct regions in V1 and V2 (Livingstone and Hubel, 1984, 1987).

Presently we have become more interested in how each of these variables is coded by cells in visual cortex. We developed a method for high-resolution receptive-field mapping in alert animals, and have used this technique to explore color perception, stereopsis and direction selectivity in primate V1, MT, V4, and IT. We have further developed this method to allow us to to look at interactions between stimuli (second-order interactions). These maps allow us to see how stimuli are integrated by single cells.