PS_Eye_Movements - Competing Goals for Visual System Design...

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1 Competing Goals for Visual System Design Maximize spatial resolution Maximize field of view Minimize neural resources
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2 Solution High resolution foveal vision Low resolution peripheral vision Eye movement system
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3 Spatial Resolution Across the Visual Field The resolution of the human visual system declines rather rapidly with distance from the center of the fovea. This falloff is primarily due to spatial filtering in the retina of the eye. It is precisely because of the this falloff that humans (and many other animals) make eye movements.
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4 There are six muscles controlling the position and movements of the eye.
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5 Types of Eye Movements •Saccadic Movements: –Scanning movements where the gaze is abruptly shifted from one point to the next: conjugate, ballistic, no visual feedback •Vergence Movements: –Cooperative movements that keep both eyes fixed on the target; converge or diverge •Pursuit movements: –Smooth tracking movements that keep an object’s image fixed in place on
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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_Eye_Movements - Competing Goals for Visual System Design...

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