Motion Perception

Motion Perception - 7 7 Motion Perception Chapter 7 Motion...

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7 Motion Perception Chapter 7 7 Motion Perception • Computation of Visual Motion • Eye Movements • Using Motion Information • The Man Who Couldn’t See Motion 7 Computation of Visual Motion How would you build a motion detector? –Involves a change in position over time. –So start with two adjacent receptors separated by fixed distance.
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7 A Neural Circuit for Detection of Rightward Motion (Part 2) 7 Computation of Visual Motion Apparent motion: The illusory impression of smooth motion resulting from the rapid alternation of objects that appear in different locations in rapid succession. Apparent motion was first demonstrated by Sigmund Exner (1875). – Neural circuit does not need real motion in order to fire. 7 Still Images from an Animation
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Computation of Visual Motion Aperture: An opening that allows only a partial view of an object – Correspondence problem (motion): The problem faced by the motion detection system of knowing which feature in frame 2 corresponds to a particular feature in frame 1. – Aperture problem: The fact that when a moving object is viewed through an aperture (receptive field), the direction of motion of a local feature or part of the object may be ambiguous. 7 Global Motion Detector 7 Computation of Visual Motion We can say something about where the global- motion detectors are: – Lesions in magnocellular layers of LGN impair perception of large, rapidly moving objects. – Middle temporal lobe: Plays important role in motion perception. – Vast majority of neurons in MT are
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Motion Perception - 7 7 Motion Perception Chapter 7 Motion...

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