Extraction of visual motion and optic flow

In medial superior temporal (MST) area of the brain, there are cells that respond selectively to specific motions of a large area of the visual field, such as rotation, expansion and contraction. Many of these cells respond steadily even when the location of the center of optic flow shifts on the retina. In an earlier paper, we proposed a neural network model that extracts optic flow based on the vector-field hypothesis. We started the discussion, however, from the stage where local velocities of visual objects have already been extracted. This paper proposes a new mechanism of extracting local velocity, and adds it to the previous network.