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Chapter 7

PSYB51 Chapter 7

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Matthias Niemeier

Chapter 7: Motion Perception - Shape, location in space, color her fundamental perceptual dimensions - Motion as a low-level perceptual phenomenoncells in primary visual cortex selectively respond to motion in one particular direction Motion aftereffect - The illusion of motion of a stationary object that occurs after prolonged exposure to moving objects - Just as color after effects are caused by opponent processes for color vision, the motion after effect is caused by opponent processes for motion detection Computation of Visual Motion - Page 171 look over - Promotion detector is velocity sensitive in their direction sensitive Apparent Motion - One possible objection to this neuronal circuit is that it does not, in fact, require continuous motion in order to fire - The Reeichardt model provides an excellent explanations were visual illusions that modern humans experience on a daily basis - Apparent motion that illusory impression of smooth motion resulting from the rapid alternation of objects that appear in different locations and rapid succession First demonstrated by Sigmund Exner in 1875 The Correspondence and Aperture Problems - Aperture - an opening that allows only a partial view of the object - Correspondence problem the problems faced by the motion detection system of knowing which feature in frame two corresponds to a particular feature in frame one example on page 173 figure 7.5 - Aperture problem the fact that when a moving object is viewed t through an aperturer, the direction of motion of a local feature or part of the objects may be ambiguous - Every V1 cell sees the world through a small aperture therefore none of them can tell with certainty which visual elements correspond to one another when an object moves - Solution to this problem is to have another set of neurons listen to the V1 neurons integrate the potentially conflicting signals Detection of Global Motion and Area MT - Lesions in the magnocellular layers of the LGN impaired perception of large, rapidly moving objects - The vast majority of neurons in MT our selective promotion in one particular 1 www.notesolution.com
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