PS_Motion_2 - Space-time plot of a moving vertical bar. 16...

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16 Space-time plot of a moving vertical bar.
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17 Top-down view (x-t) of the space time plots of a moving bar. Motion receptive fields are oriented in space-time.
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18 Robert Adams described the waterfall illusion after visiting this waterfall in 1834 (Aristotle, 384-322 BCE, noted this effect). This effect is predicted by adaptation of direction selective neurons in the visual cortex. To explain other motion mechanisms we need to talk about a couple of computational problems that arise in motion perception.
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19 Correspondence Problem ?? ? The correspondence problem in motion perception becomes most obvious in the case of “apparent motion”, a phenomena exploited to create movies. This is not a very common problem under natural viewing conditions.
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20 When a moving object is viewed through a small aperture (such as the small region that a V1 receptive field covers) there can be considerable confusion about the actual direction of motion. This is the “aperture” problem. This is much more common problem even under natural conditions.
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This note was uploaded on 08/12/2008 for the course PSY 323P taught by Professor Geisler during the Spring '08 term at University of Texas at Austin.

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PS_Motion_2 - Space-time plot of a moving vertical bar. 16...

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