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Abstract:
A model of motion detection is presented. The model contains
three stages. The first stage is unoriented and is selective for
contrast 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 sensitivity 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.
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