Qian Xiao and Barrie J. Frost Motion parallax processing in pigeon (Columba livia) pretectal neurons European Journal of Neuroscience 37
Using electrophysiological techniques, we show that the pretectal neurons in pigeons code depth through motion parallax similar to that employed to stereopsis. During forward translational motion, some neurons preferred backward fast motion of flow-fields and others preferred forward fast motion, and both were facilitated by slow flow-field motion in the opposite direction, suggesting they may code visual objects ‘nearer’ and ‘farther’ than the stabilized (‘on’) plane coded by slow neurons.
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