Detection of First and Second Order Motion

Part of Advances in Neural Information Processing Systems 10 (NIPS 1997)

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Alexander Grunewald, Heiko Neumann


A model of motion detection is presented. The model contains three stages. The first stage is unoriented and is selective for con(cid:173) trast polarities. The next two stages work in parallel. A phase insensitive stage pools across different contrast polarities through a spatiotemporal filter and thus can detect first and second order motion. A phase sensitive stage keeps contrast polarities separate, each of which is filtered through a spatiotemporal filter, and thus only first order motion can be detected. Differential phase sensitiv(cid:173) ity can therefore account for the detection of first and second order motion. Phase insensitive detectors correspond to cortical complex cells, and phase sensitive detectors to simple cells.