Ch. 9 Perceiving Motion_For Students

Ch. 9 Perceiving Motion_For Students - Motion Perception...

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Unformatted text preview: Motion Perception Todays Questions Motion perception : Why is motion perception important? What are the different types of motion? How do sensory & motor signals interact? What are the physiological correlates? What is the role of top-down processing? Motion Perception Functions Motion 1. Aids in object detection Motion Perception Functions Motion 2. Aids in object identification Motion Perception Functions Motion 3. Provides info about object shape Kinetic depth effect = movement of 2D shadow provides info about objects 3D structure Motion Perception Functions Motion 4. Provides info about causality Time 1 Time 2 Time 3 Hitting Chasing Types of Motion Different types of motion : Real motion Illusory motion Apparent motion Anomalous motion Induced motion Aftereffect motion Types of Motion Real motion = physical movement of a stimulus Types of Motion Apparent motion = illusion of motion when 2 objects, separated in space, are alternately flashed on & off A.k.a. Stroboscopic motion / phi phenomenon Types of Motion Apparent motion : The whole is different than the sum of the parts Max Wertheimer Types of Motion Anomalous motion = illusion of motion, often due to luminance gradient Types of Motion Apparent motion : Anomalous apparent motion Types of Motion Induced motion = illusion of motion of 1 object, due to motion of nearby object A.k.a. Relative motion / Duncker illusion Physical motion Perceived motion Types of Motion Aftereffect motion = illusion of motion in 1 direction after staring at a stimulus moving in the opposite direction E.g. Waterfall illusion Spiral motion aftereffect Implication: motion detecting neurons exist Sensory & Motor Signals Motion processing systems : 1. Image-retina system: Eye is stationary Local disturbance in optic array: retinal image motion = object motion No disturbance in optic array: no retinal image motion = no object motion Sensory & Motor Signals Motion processing systems : 2. Eye-head system: Eye is moving Tracking an object: no retinal image motion = object motion Global optic flow: retinal image motion = no object motion Sensory & Motor Signals...
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This note was uploaded on 11/12/2009 for the course PSY 3321 taught by Professor Ceballos during the Spring '09 term at Texas State.

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Ch. 9 Perceiving Motion_For Students - Motion Perception...

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