Lecture 13 Motion

# Motion is a change in position over time b how is

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Motion is a change in position over time B. How is motion computed? Motion detection How would you build a motion detector based on changes in the position of an object over time? Start with two adjacent receptors. Each registers change in position Incorporate a delay. Accounts for change in time B. How is motion computed? Motion detection Constructing a neural circuit for the detection of rightward motion B. How is motion computed? Motion detection How would this network treat apparent motion?

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5/22/2013 4 B. How is motion computed? The “aperture” problem Aperture: An opening that allows only a partial view of an object Aperture problem: The fact that when a moving object is viewed through an aperture (or a receptive field), the direction of motion of a local feature or part of an object may be ambiguous. B. How is motion computed? The Aperture Problem Aperture problem - observation of small portion of larger stimulus leads to misleading information about direction of movement Activity of a single V1 cell does not provide accurate information about direction of movement. ( demo ) B. How is motion computed? The Aperture Problem Movement within aperture is perpendicular to the edge B. How is motion computed? The Aperture Problem
5/22/2013 5 Aperture problem Given that motion within any single aperture (or receptive field) is ambiguous, how might the visual system correctly perceive the overall motion of objects? Motion information from several local apertures (or receptive fields) can be combined to determine the global motion of the object. There are several directions of motion within each aperture that are compatible with the stimulation the receptor is receiving.

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• Winter '07
• D.Whitney
• motion detection

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