![]() An important step in understanding the visual mechanisms serving the perception of depth from motion parallax is to determine the relationship between these stimulus parameters and empirically determined perceived depth magnitude. The motion/pursuit ratio represents a dynamic geometric model linking these two proximal cues to the ratio of depth to viewing distance. The perception of unambiguous scaled depth from motion parallax relies on both retinal image motion and an extra-retinal pursuit eye movement signal. 2Math Department, University of Iowa, Iowa City, IA, USA.1Department of Psychology, Center for Visual and Cognitive Neuroscience, North Dakota State University, Fargo, ND, USA. ![]() Since learning more about perceptual organization in psychology class, I now know that this artificial difference in rate can be classified as motion parallax, just as the snow fall that you described can be categorized as motion parallax as well.Mark Nawrot 1 *, Michael Ratzlaff 1, Zachary Leonard 1 and Keith Stroyan 2 ![]() Last time I made the trip to State College I was looking out of the window and noticed that the cars driving past mine seemed to be moving extremely fast, while the mountains in the background seemed to be moving at a much slower rate. For example, on the ride from Philadelphia to State College there are many mountains, rivers, and tons of traffic. I have noticed that whenever I am on road trips and looking out of the window, objects far from be appear to be moving very slowly, while objects close to me are moving extremely fast. I have also noticed similar things with motion parallax, but in a different context. That is a good point, usually we wouldn’t think twice about the rate at which snow is falling, but now that we have learned about motion parallax it is interesting to see how something as quintessential as snow fall can be applied to topics in psychology. Post navigation Previous post: ← Forgetting and Examples of Attention Deficit Next post: Infantile Amnesia and Memory Implantation → This entry was posted in Perceptual Organization, Uncategorized and tagged motion parallax, perceptual organization on Maby Isabella Ayeras. Have you ever experienced a similar phenomenon? These illusions are so powerful that they could have made me think that the snow actually was falling quickly closer to me, however I don’t believe this would even be possible. Perceptual organization examples such as this are interesting and can help us to understand more about the illusions that our eyes create. Prior to this class, I probably wouldn’t have thought twice about the rate of snowfall. So, when I looked at the snowfall, my perception was that the snow was falling at different speeds everywhere that I focused my attention. Our eyes trick us into thinking that closer objects are moving faster and farther ones slower because with monocular cues such as relative size, interposition/occulsion, aerial perspective, linear perspective, texture gradient, and, of course, motion parallax, our depth perception only uses 1 eye to judge distances. Motion parallax is when objects that are closer to you seem to move at a quicker pace than those farther away from you. This is when I realized that I was observing the monocular cue known as motion parallax that we had learned about a few days prior. However, the speed of snowflakes was not different right next to my window compared to a few feet away. When I looked at the snow closest to my window, it seemed to fall quickly and, at times, almost violently. This was that as I looked at the snow falling closest to the brick wall, several feet away from my window, the snow seemed to fall very peacefully. The speed appeared to change with the wind, so I watched for a minute and noticed something peculiar. Last Thursday, as I was getting ready to head out to my calculus quiz, I looked out the window adjacent to my desk and noticed flurries of snow.
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