It is a tribute to Duchamp's cubist painting titled "Nude Descending a Staircase" in which the changing pattern of light gives the illustion of motion even though she never gets anywhere (you made need to double-click on the image below or reload the page for the animation to play).Īnother example is the motion aftereffect. Below is one example of a visual illusion of motion that I made. In class I showed you a number of demonstrations in which motion is misperceived. Motion is a perceptual attribute: the visual system infers motion from the changing pattern of light in the retinal image. Corrolary discharge explains why eye movements do not evoke a perception of motion.STS is specialized for recognizing biological motion.Cortical area MST is functionally speicalized for optic flow.Well-defined pathway of brain areas (cascade of neural computations) underlying motion specialization in MT.Computational theory quantitatively explains both the responses of MT neurons and the perception of visual motion.Electrical stimulation in MT causes changes in visual motion perception.Damage to MT or temporary inactivation causes deficits in visual motion perception.Neural responses in MT are correlated with the perception of motion.Neurons in MT are selective for motion direction.Cortical area MT is functionally specialized for motion.Motion aftereffect and other motion illusions.For example: - Sara needs both of her eyes open to see the pencil coming closer near her eyes (Convergence).Perception Lecture Notes: Visual Motion Perception Perception Lecture Notes: Visual Motion Perception What you should know about this lecture It includes retinal disparity and convergence. They look hazy because of the presence of small water and dust particles in the air.īinocular cues: - The type of cues that makes use of both the eyes to perceive the surrounding information. Motion parallax: - Whenever one travels in a bus/train, the objects that are farther away are visible and constant for more time than the objects located closer, which move and disappear from the sight faster.Īerial perspective: - Mountains located farther away look hazy as the distance from them increases. Overlap: - When one object is partly covered by another object, then the object located on the top is perceived as closer. For example: -looking at a straight railway track far away. Linear perspective: - Whenever people look at two parallel straight lines, one could see them merging on the horizon. if an object is smooth or rough (texture gradient). For example: - Ricky can close one of his eyes but he can still perceive the nature of texture i.e. It includes various cues like relative size, aerial perspective, linear perspective, overlap, motion parallax etc. Monocular cues: - The cues that make use of only one eye to sense the information from the surrounding. There are two main types of cues, which helps one to perceive the surrounding in a three-dimensional view. But if the object is placed farther away, the difference between the images of two eyes is lesser. If the object is placed closer, the difference between the images of two eyes is quite significant. It gives slightly different information about size, shape, and positioning of an object. This is the reason behind why the eyes see the world with a slight difference. The eyes are 6.3 centimeters apart from each other. In the case of binocular cues for depth perception, which is retinal disparity and convergence, information is collected from the left and right eyes and the separately collected information is integrated in a part of the brain to construct a three-dimensional view. Binocular cues are opposite to monocular cues, which involves the use of only one eye for gathering surrounding information. Retinal disparity is also known as binocular parallax. Binocular cues are the information cues for gathering information about the depth of an object. It involves the use of both the eyes hence, it is placed under the category of binocular cues. Retinal disparity is a form of depth perception.
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