Motion - predators motion information • Sex and emotional...

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Motion Perceiving motion o Static observer – you are stationary and other obj are moving relative to you o Moving observer What would life be like w/o ability to perceive motion o 43 yr old woman who had bilateral stroke to medial temporal area o The patient had great difficulty pouring coffee into a cop she could see the cup shape color and position on the table (could perceive location) and she was able to pour the coffee from the pot but column of fluid flowing from the spout appeared frozen like a waterfall turned to ice, she could not see its motion so the coffee would rise in the cup and spill over the sides. More dangerous problems arose outdoors, she could not cross the street bc the motion of cars was invisible to her Function of motion perception o Motion attracts attention o Motion conveys info Gestural info Direction of self-movement Points in the visual field move away from each other - expansion Obj identification Figure ground segregation – prey animals freeze so as not to give
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Unformatted text preview: predators motion information • Sex and emotional state • 3d shape from 2d motion o Events that’s elicit motion perception Real motion Illusory motion – apparent motion (basis for animation) • Control condition P’s view 2 sqs in 2 diff location compared to real motion (sq moves back and forth) when motion is apparents th, the physical stimulus is different in real and apparent motion, the P’s participant perceived it, acitivyt in cortex similar to the pattern evoked when the motion was real • When a stationary obj appears to move in a direction opposite that of a moving context. Ex: perceive the train you are on to move but its really the train next to you moving • Baseline level of activity Motion aftereffects (waterfall illusion) • o Types of motion First order motion – spatio temporal change in luminance Second-order motion – spatio temporal change in some quality other than luminance (contrast, texture)...
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