10 Evaluation Essay Topics on the Spatial Order in Human Visual Perception

10 Evaluation Essay Topics on the Spatial Order in Human Visual Perception Are you having trouble writing an evaluation essay on the spatial order in human visual perception? If that’s the case, you can put your worries aside. Over the years, we’ve been helping students like you master the art of good essay writing. In this first guide, we discuss 10 facts on the spatial order in human visual perception. These facts will come in handy during the essay writing process and aid you in writing a highly precise essay which will leave quite the impression on your professor. Our second guide outlines 20 topics on the spatial order in human perception. These topics are relevant to the facts mentioned in this guide. We’ve also included a sample essay on the spatial order in human visual perception so that it becomes easier for you to write the actual essay and borrow ideas from the sample, so to speak. Finally, the third one is an academic guide to writing an evaluation essay on the spatial order in human visual perception. By reading this guide, you will be able to outline and seamlessly write a stellar essay. Without further ado, here are 10 facts on the spatial order in human visual perception: The human visual perception is far beyond our imagination. When we see our Earth’s surface, it appears that we can see nothing more than a few kilometers that lead up to the horizon. This is because the surface of the Earth literally curves out of sight after 5 kilometers.If the Earth’s surface were to be flat on the other hand, you would see a flickering candle flame even 48 kilometers away. In addition, our naked eye can see the Andromeda galaxy, which is located 2.6 million light-years away from Earth. The source of light that enters our retina travels from 1 trillion stars in the galaxy. Technically, we can see the color red with our naked eye, but in theory, it’s quite the opposite. Some scientists believe that the retina has receptors similar to that of an RGB (red, green, blue color spectrum) monitor. However, the eye’s retina can’t detect red shades. The so-called â€Å"red† receptor actually detects yellow-green hues whereas the â€Å"green† receptor detects blue-green colors or hues. These colors are then differentiated by our brain which tells us to see red colors. Selig Hecht, known for his remarkable work on human eye perception, made an accurate measurement of the human vision’s absolute threshold in 1941; i.e. the number of photons that must strike our retinas in order to stimulate the brain with visual awareness.The study that led to such a remarkable discovery was performed under ideal conditions where participants were allowed to adapt to total darkness; flashlights of 510 nanometer blue-green wavelength, acted as a stimulus, to which the human eye is most sensitive. It was concluded that our brain interprets vision when the retina is exposed to 5 14 photons. The human eye perception is limited to a certain degree. We are only able to see colors between 350 to 700 nanometer wavelengths. This is why we are not able to perceive ultraviolet and infrared colors. Ultraviolet colors fall in shorter wavelengths than 350 nanometers, whereas infrared colors are longer than 700 nanometer wavelengths. For example, when you take a look at bananas, you see the color yellow because they bounce off color wavelengths of 570-580 nanometers, when hit by full spectrum light. Have you ever asked yourself why you see things in 3D? Our brain is responsible for reconstructing images which let us experience life from a 3D perspective. This is because we have a pair of eyes that gives birth to a phenomenon known as Binocular Disparity – a slight difference in perspective between the left and right eye. Binocular disparity plays a vital role in giving depth to a scene. Convergence is another phenomenon which signals the brain to create depth of field, particularly when you are focusing on something close to your eyes. While we can see and perceive colors at the center in high resolution, our peripheral vision is very low in resolution – it’s blurry and nearly monochrome. However, we don’t actually see our peripheral vision as a monochrome image because our eyes and brain are quick enough to fill in the required details as soon as we become aware of this fact. It takes time for the human eye to perceive visual depth of a scene. The brain of a newborn child is not fully developed and must adapt to the new environment first before learning to construct a three- dimensional perspective. A study on infants has revealed that it takes a two months old baby to construct depth awareness of an image. Human visual perception is able to â€Å"adjust† to the dark by activating its own ‘night vision mode’. The neural pathways of the brain recalibrate themselves chemically to turn on scotopic vision circuits. These circuits are normally off during the daytime and require 20 minutes of darkness to be active. Scotopic vision circuits do not adapt to colors other than blue, as their receptors are blue-sensitive. You might have noticed how everything tends to take a bluish hue when you are trying to see in the dark. Ever thought why you can see the stars twinkling and shining at night? It’s because these receptors are very sensitive to even minor fluctuations in light. The brain is the main asset behind our visual perception. The eyes are merely tools to perceive light and transfer it to receptors that signal the brain to form images. The brain is, for a fact, the main component that constructs images and enables us to see perfectly. For example, our retina captures and interprets everything upside down, but still, we see everything the right side up. There are 100 million photoreceptors in each eye that enable us to see crystal clear images. However, there is only a million nerve fibers that act as a bridge to the eyes and brain. So, technically speaking, the resolution of our eye is not more than 1 megapixel. These facts will help you come up with your own topics and create masterpieces. For more guidance, head to our second and third guides. References: Natalie Wolchover, 2012 â€Å"How Far Can the Human Eye See?† Livescience  livescience.com/33895-human-eye.html Stephanie Pappas, 2010 â€Å"How Do We See Color?† Livescience  livescience.com/32559-why-do-we-see-in-color.html Stephanie Pappas, 2010 â€Å"Why Do We See in 3-D?† Livescience  livescience.com/32580-why-do-we-see-in-3-d.html Fiser, J., Aslin, R. N., 2001 â€Å"Unsupervised statistical learning of higher-order spatial structures from visual scenes† Psychological science, 12(6), 499-504. Gale Encyclopedia of Psychology, 2001 â€Å"Depth Perception† Encyclopedia  encyclopedia.com/doc/1G2-3406000183.html Brain Resources, â€Å"How Vision Works† Brain HQ  brainhq.com/brain-resources/brain-facts-myths/how-vision-works Paul King, 2016 â€Å"Visual Perception: What are some Mind Blowing Facts about the Human Eye?† Quora  https://www.quora.com/Visual-Perception-What-are-some-mind-blowing-facts-about-the-human-eye

Sarah Mapps Douglass and the Anti-Slavery Movement

Sarah Mapps Douglass and the Anti-Slavery Movement Known for:  her work in educating African American youth in Philadelphia, and for her active role in antislavery work, both in her city and nationallyOccupation:  educator, abolitionistDates:  September 9, 1806 - September 8, 1882Also known as:  Sarah Douglass Background and Family Mother: Grace Bustill, milliner, daughter of Cyrus Bustill, a prominent Philadelphia African AmericanFather: Robert Douglass, Sr., hairdresser and businessmanHusband: William Douglass (married 1855, widowed 1861) Biography Born in Philadelphia in 1806, Sarah Mapps Douglass was born into an African American family of some prominence and economic comfort.  Her mother was a Quaker and raised her daughter in that tradition. Sarah’s maternal grandfather had been an early member of the Free African Society, a philanthropic organization. Though some Quakers were advocates of racial equality, and many abolitionists were Quakers, many white Quakers were for separation of the races and expressed their racial prejudices freely.  Sarah herself dressed in Quaker style, and had friends among white Quakers, but she was outspoken in her criticism of the prejudice that she found in the sect. Sarah was educated mostly at home in her younger years. When Sarah was 13 years old, her mother and a wealthy African American businessman of Philadelphia, James Forten, founded a school to educate the African American children of the city.  Ã‚  Sarah was educated in that school. She got a job teaching in New York City, but returned to Philadelphia to lead the school in Philadelphia.  She also helped to found a Female Literary Society, one of many in a movement in many Northern cities to encourage self-improvement, including reading and writing.  These societies, in a commitment to equal rights, were often incubators for organized protest and activism, as well. Antislavery Movement Sarah Mapps Douglass was also becoming active in the growing abolitionist movement. In 1831, she had helped raise money in support of William Lloyd Garrison’s abolitionist newspaper, The Liberator. She and her mother were among those women who, in 1833, founded the Philadelphia Female Anti-Slavery Society.  This organization became a focus of her activism for most of the rest of her life. The organization included both black and white women, working together to educate themselves and others, both through reading and listening to speakers, and to promote action to end slavery, including petition drives and boycotts. In Quaker and anti-slavery circles, she met Lucretia Mott and they became friends. She became quite close to the abolitionist sisters, Sarah Grimkà © and Angelina Grimkà ©. We know from the records of the proceedings that she played a significant role in national antislavery conventions in 1837, 1838 and 1839. Teaching In 1833, Sarah Mapps Douglass founded her own school for African American girls in 1833.  The Society took over her school in 1838, and she remained its headmaster.  In 1840 she took back control of the school herself. She closed it in 1852, instead  of going to work for a project of the Quakers – for whom she had less rancor than earlier - the Institute for Colored Youth. When Douglass’ mother died in 1842, it fell on her to take care of the house for her father and brothers. Marriage In 1855, Sarah Mapps Douglass married William Douglass, who had first proposed marriage the year before.  She became stepmother to his nine children he was raising after the death of his first wife.  William Douglass was the rector at St. Thomas Protestant Episcopal Church.  During their marriage, which seems not to have been particularly happy, she limited her antislavery work and teaching, but returned to that work after his death in 1861. Medicine and Health Beginning in 1853, Douglass had begun studying medicine and health, and took some of the basic courses at the Female Medical College of Pennsylvania as their first African American student. She also studied at the Ladies’ Institute of Pennsylvania Medical University.  She used her training to teach and lecture on hygiene, anatomy and health to African American women, an opportunity which, after her marriage, was considered more proper than it would have been if she had not been married. During and after the Civil War, Douglass continued her teaching at the Institute for Colored Youth, and also promoted the cause of southern freedmen and freedwomen, through lectures and fund-raising. Last Years Sarah Mapps Douglass retired from teaching in 1877, and at the same time discontinued her training in medical topics.  She died in Philadelphia in 1882. She asked that her family, after her death, destroy all her correspondence, and also all of her lectures on medical topics.  But letters which she had sent to others are preserved in the collections of her correspondents, so we are not without such primary documentation of her life and thoughts.