Things that are further away slide across the retina more slowly. For example, hold up two fingers (one on each hand) at different distances, and move your head slowly from side to side while fixating an object on a far wall. Compute the distance to various objects in the scene and estimate the direction in which you are heading within the scene.Segmentation of foreground from background.Simply detecting that something is moving, draws your attention.Role of motion perception: Motion perception serves lots of Sensitive to motion and selective for the direction of motion, whichĪdapt to the stimulus (analogous to color adaptation after-effects).īelow is yet another example of a motion illusion. We take this as evidence for the existence of neurons that are Local in the retina (to the right of where you were looking, you wereĪdapting to rightward motion, to the left you adapted to leftward, and The demonstration above shows that this adaptation is This is sometimesĬalled the "waterfall illusion" - if you look at a waterfall for a Time, if you look at a stationary object, it appears to move in theĭirection opposite to the one you were viewing. Stare at the center of the following animation for about a minute, as it expands continuously (you may need to reload the page to get it moving again after it stops), then fix your gaze on colorful texture pattern next it it.Īfter viewing continuous motion in the same direction for a long 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.When filming with a wide field of view being close to the foreground subject is often more efficient than putting too much distance between camera and subject.Perception Lecture Notes: Visual Motion Perception Perception Lecture Notes: Visual Motion Perception What you should know about this lecture A wide-angle shot can even be the better choice for slow movement due to the distortion of the lens. In general, it makes sense to try different focal lengths and distances between camera and subject to achieve the wanted result. Tips for getting the most out of the effect: But keep in mind that the background also needs to have a bigger distance towards the foreground subject. The motion effect can also be increased by putting a bigger distance between the foreground subject and the camera. The most dramatic effect can be achieved by using a tele-photo focal length. The parallax effect can be achieved by either using a dedicated camera slider that pans while moving from one side to the other, with a camera stabilizer or a gimbal which could even orbit the subject as well as with a dolly that is set up on a circular camera track. For what is this technique being used in filmmaking?Ī common way to use this camera technique in filmmaking is to put an actor or a subject in the center with the camera moving either 180° or 360° around the person.
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