{"id":388252,"date":"2019-07-02T11:41:56","date_gmt":"2019-07-02T15:41:56","guid":{"rendered":"http:\/\/www.rochester.edu\/newscenter\/?p=388252"},"modified":"2019-07-18T14:05:13","modified_gmt":"2019-07-18T18:05:13","slug":"why-are-we-able-to-see-moving-objects-against-moving-backgrounds-388252","status":"publish","type":"post","link":"https:\/\/www.rochester.edu\/newscenter\/why-are-we-able-to-see-moving-objects-against-moving-backgrounds-388252\/","title":{"rendered":"Why can we see moving objects against their backgrounds?"},"content":{"rendered":"<p>Visual motion is an important source of information for separating objects from their backgrounds.<\/p>\n<p>A spider camouflaged against a branch, for instance, immediately loses its invisibility once it starts moving. A friend you\u2019re trying to spot in a crowded airport terminal is more distinguishable once she begins waving her hands.<\/p>\n<p>While the process of separating an object from a background is seemingly effortless, researchers don\u2019t know how our visual system manages to rapidly pick out and segregate moving objects from their backgrounds.<\/p>\n<p>According to new research from scientists at the University of Rochester, one reason human beings are good at discerning smaller moving objects in the foreground is that the brain becomes desensitized to the motion in the larger background. Conversely, when a person\u2019s brain is more sensitive to background motion, the negative trade-off is that she will be less sensitive to smaller foreground objects. The research, published in the journal <em>Nature Communications<\/em>, could lead to new training programs for elderly adults and patients with conditions such as schizophrenia, which has been linked to weaker motion segregation.<\/p>\n<div class=\"embed-container\"><iframe loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/1h3eH-FrEGU\" width=\"560\" height=\"315\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/div>\n<h3><strong>Focusing on objects that matter<\/strong><\/h3>\n<p>\u201cThe human brain cannot possibly process all of the information around us,\u201d says <a href=\"http:\/\/www.sas.rochester.edu\/bcs\/people\/faculty\/tadin_duje\/index.html\">Duje Tadin<\/a>, a professor of brain and cognitive sciences at Rochester and the lead author of the study. \u201cBeing less sensitive to things that are less important makes the brain more efficient and faster at accomplishing the more important tasks.\u201d<\/p>\n<p>Take driving for instance. As the background scenery whizzes by, it is imperative that a driver see and avoid cars, pedestrians, and other objects on the road.<\/p>\n<p>There are two basic ways the brain can distinguish such objects from moving backgrounds. It can enhance the objects that matter; or, it can suppress the background, and, by virtue of this suppression, enhance the objects. The latter is \u201cthe more efficient option,\u201d Tadin says. \u201cThink about trying to have a conversation in a room with high background noise. It is more effective to find a way to turn off the noise than it is to just try speaking more loudly.\u201d<\/p>\n<p>While these strategies are not the only ones the brain uses to highlight moving objects\u2014attention is another factor, for instance\u2014<a href=\"https:\/\/www.rochester.edu\/newscenter\/whats-your-motion-quotient\/\">previous research<\/a> from Tadin\u2019s lab found a link between IQ and an ability to suppress background motion. The <a href=\"http:\/\/www.rochester.edu\/news\/show.php?id=3752\">researchers speculated<\/a> that in healthy, young people, a region in the brain called the middle temporal visual area (MT) is responsible for this suppression.<\/p>\n<h3><strong>Better at seeing objects, worse at seeing backgrounds<\/strong><\/h3>\n<p>In order to test people\u2019s ability to identify moving objects on a moving background, the researchers showed study participants moving textured patterns. Within the textured background, there was a smaller patterned object moving in the direction opposite from the background. The participants were instructed to report either the location or the shape of the smaller patterned object.<\/p>\n<div class=\"pullquote\">A split second could mean the difference between hitting or avoiding a pedestrian.<\/div>\n<p>The researchers found that younger adults were better at seeing smaller moving objects in the foreground and worse at seeing background motion. Older adults\u2014participants aged 65 and above\u2014were the opposite. They were poorer at seeing the smaller moving objects because they had a heightened awareness of the backdrop against which the objects moved. Younger adults took on average 20 milliseconds to pick out the moving objects, and older adults took about 30 milliseconds.<\/p>\n<p>While both groups were efficient at the task, taking only a fraction of a second to detect the movement of the object against the background, \u201cthose extra milliseconds could make a big difference,\u201d says <a href=\"https:\/\/sites.google.com\/view\/woonjupark\">Woon Ju Park<\/a>, a former postdoctoral associate in Tadin\u2019s lab and currently a research associate at the University of Washington. \u201cThink about things that matter for your survival.\u201d A split second could mean the difference between hitting or avoiding a pedestrian; or it could be just enough time to lose sight of a rambunctious child. In the case of the animal world, it could mean the difference between life and death.<\/p>\n<p>\u201cThink of an animal in the wild,\u201d Park says. \u201cIf it sees a moving object, that could either be lunch for the animal or something that could eat that animal for lunch. Animals are really good at camouflage, but even the best camouflage pulls apart with motion.\u201d<\/p>\n<p>The researchers speculate that older adults have impaired motion segregation because as people age, their vision changes and becomes \u201cnoisier.\u201d As an adaptive mechanism, the aging brain then might prioritize integrating motion information in general over suppressing and segmenting background from foreground. The results also suggest that people with psychiatric conditions such as schizophrenia\u2014associated with similar \u201cnoisier\u201d visual systems\u2014might also experience the trade-off between integration and segregation.<\/p>\n<h3><strong>Training increases brain\u2019s ability to process moving objects<\/strong><\/h3>\n<p>Although the research shows that the ability to detect moving objects against a moving background decreases with age, the research also offers some good news for older adults.<\/p>\n<p>\u201cWith training, we can make older adults be more like younger adults,\u201d Tadin says.<\/p>\n<p>The researchers found that older adults could train their brains to process motion more like younger adults by practicing visual segmentation of moving objects. Older participants performed the study task for four weeks, with four sessions per week, and became quicker at the task, narrowing the gap in performance with their younger counterparts. Surprisingly, the researchers found, the older participants who underwent training did not in fact get better at seeing the smaller moving object; their ability to see the object was just as good as it was at the beginning of the training. What changed with training was that the older adults became less sensitive to the background motion, just like younger adults.<\/p>\n<p>\u201cMost of the time when you train something in the brain, things get better,\u201d Tadin says. \u201cThis is a case where, with training, you get better at seeing objects, while at the same time get worse at seeing the background. This showed us that these two things are really integrally connected, because when we affected one, the other one also changed.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"<p>New research from Rochester scientists explores why human beings are good at discerning moving objects and how we can train our brains to be better at this as we age.<\/p>\n","protected":false},"author":912,"featured_media":389062,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[116],"tags":[18672,6096,29502,18572,16072,19502],"class_list":["post-388252","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sci-tech","tag-department-of-brain-and-cognitive-sciences","tag-duje-tadin","tag-featured-post-side","tag-research-finding","tag-school-of-arts-and-sciences","tag-vision"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Why can we see moving objects against their backgrounds?<\/title>\n<meta name=\"description\" content=\"New Rochester research explores why human beings are good at discerning moving objects and how we can train our brains to be better at this as we age.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.rochester.edu\/newscenter\/why-are-we-able-to-see-moving-objects-against-moving-backgrounds-388252\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why can we see moving objects against their backgrounds?\" \/>\n<meta property=\"og:description\" content=\"New Rochester research explores why human beings are good at discerning moving objects and how we can train our brains to be better at this as we age.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.rochester.edu\/newscenter\/why-are-we-able-to-see-moving-objects-against-moving-backgrounds-388252\/\" \/>\n<meta property=\"og:site_name\" content=\"News Center\" \/>\n<meta property=\"article:published_time\" content=\"2019-07-02T15:41:56+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2019-07-18T18:05:13+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.rochester.edu\/newscenter\/wp-content\/uploads\/2019\/06\/fea-moving-objectsjpg.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1000\" \/>\n\t<meta property=\"og:image:height\" content=\"600\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Lindsey Valich\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Lindsey Valich\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/why-are-we-able-to-see-moving-objects-against-moving-backgrounds-388252\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/why-are-we-able-to-see-moving-objects-against-moving-backgrounds-388252\\\/\"},\"author\":{\"name\":\"Lindsey Valich\",\"@id\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/#\\\/schema\\\/person\\\/fcd7d29a5b8e855924bf73b764dcd827\"},\"headline\":\"Why can we see moving objects against their backgrounds?\",\"datePublished\":\"2019-07-02T15:41:56+00:00\",\"dateModified\":\"2019-07-18T18:05:13+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/why-are-we-able-to-see-moving-objects-against-moving-backgrounds-388252\\\/\"},\"wordCount\":1018,\"image\":{\"@id\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/why-are-we-able-to-see-moving-objects-against-moving-backgrounds-388252\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.rochester.edu\\\/newscenter\\\/wp-content\\\/uploads\\\/2019\\\/06\\\/fea-moving-objectsjpg.jpg\",\"keywords\":[\"Department of Brain and Cognitive Sciences\",\"Duje Tadin\",\"featured-post-side\",\"research finding\",\"School of Arts and Sciences\",\"vision\"],\"articleSection\":[\"Science &amp; 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