Strabismus
A camera lens focuses patterns of light onto film which records the image exactly. If the lens is out of focus or partially covered, a b lurry or obscured picture will result. The film is a recording device, it does not interpret and select what it portrays. Images from a camera are objective in a very literal sense. Seeing, however, is not such a seamless process. Our eyes work similarly to a camera in that they have a lens which focuses a real image on our retina, a light sensitive sheet of cells. This retinal image is a portrayal of the world as it truly is. The image which we see, however, is not this image. By considering a normal vis ual property as well as an uncommon ocular disorder the process of formulating our visual sense will be investigated. There is a difference between the picture recorded on film and that recorded by our brains. For purposes of this paper, the term "retina l image" is used as an analogy to a photographic image (one without interpretation by the brain). The phrase "brain image" refers to the retinal image post-brain interpretation. The brain image is the image which would be described by the person, the imag e which is thought of as seeing.
This phenomena of brain interpretation is easily demonstrated by discovering one's blind spot. (A good self experiment is described at 1) The blind spot results from an area of the retina which does n ot have photoreceptor nerve cells, the optic nerve head. Yet, even without this seemingly vital information, the brain is able to supply us with a complete brain image. The brain has filled in the blind spot with an image which it believes makes sense. Ha ving explored the blind spot, one can understand that what is captured in the brain image m...
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...have been ignored is forced to develop. Adult onset strabismus, however, results in double vision because the brain can not simply ignore the one image that does not make sense. This type of strabismus can not be treated with patching, as their brains have already developed a patte rn which uses both eyes to comprise the brain image. (4) (5)
This exploration of strabismus has shown that the brain is a very active participant in determining our perception of the world around us. Visual informati on received by the eye is only part of the story, the brain takes these images and selects what is useful, discarding (strabismus) as well as adding (blind spot) information, thus, constructing our visual experience.
Internet Sources:
http://serendip.brynmawr.edu/bb/blindspot1.html
http://www.hhmi.org/senses/b410.html
http://www.seekwellness.com/index.htm
The ultimate goal for a system of visual perception is representing visual scenes. It is generally assumed that this requires an initial ‘break-down’ of complex visual stimuli into some kind of “discrete subunits” (De Valois & De Valois, 1980, p.316) which can then be passed on and further processed by the brain. The task thus arises of identifying these subunits as well as the means by which the visual system interprets and processes sensory input. An approach to visual scene analysis that prevailed for many years was that of individual cortical cells being ‘feature detectors’ with particular response-criteria. Though not self-proclaimed, Hubel and Wiesel’s theory of a hierarchical visual system employs a form of such feature detectors. I will here discuss: the origins of the feature detection theory; Hubel and Wiesel’s hierarchical theory of visual perception; criticism of the hierarchical nature of the theory; an alternative theory of receptive-field cells as spatial frequency detectors; and the possibility of reconciling these two theories with reference to parallel processing.
Picture this: you're having a nice weekend at the lake with your family, fishing, swimming, and having an all-around great time. But then you notice that your boat isn't running as well as it should, especially considering you just cleaned it and made sure everything was in perfect condition before leaving your house. Puzzled, you take your boat out of the water to notice that the hull and motor is covered in tiny clam-like creatures, making your pristine white boat look like something that was just drug out of the bottom of the lake. What are these animals that ruined your weekend of fun? They are zebra mussels, and are found in lakes, rivers, and other bodies of freshwater across the U.S. Normally found in Eastern Europe, the first group of this invasive species hitched a ride in the ballast tanks of ocean liners in the 1980s, and quickly spread. Regulations are in place to stop the spread, but removing them from places that have already been infested is tricky. Today we will talk about the damages zebra mussels cause, how this problem is managed, and what you can do to help.
Merleau-Ponty distinguishes three aspects of the psychological process; basic sensations, perception, and the associations of memory (Merleau-Ponty, 1994). Basic sensations receive raw information from the world and transduce them for our perceptual processes. Perception unifies the infinite amount of information about our environment, from our environment, into a meaningful structure. Perception is interpretive, but its presentation of the world is as distal and objective. There are three central features of perception for Merleau-Ponty. First, perception is synthesized independently by the body and not by the mind (consciousness).
In presidency, character is everything. Born on February 6, 1911, Ronald Reagan, “Dutch,” never knew that he would grow up to be famous. He served two terms as governor of California, but before that he starred in Hollywood films. Originally a liberal Democrat, Reagan ran for the U.S. presidency as a conservative Republican and won, his term beginning in 1980. Ronald Reagan became the oldest President elected when he took office as the 40th President of the United States. He was also the first U.S. president after Dwight D. Eisenhower to get re-elected and finish two complete terms in office. Reagan was president from January 20, 1981 to January 20, 1989. He was an effective president, measured by his popularity and by his influence on history. This former U.S. president is given rightful credit for three large historic gains during his presidency: First, he won the Cold War without firing a shot, then, he revived the American economy that resulted in substantial growth and lastly, he restored the traditional spirit of can-do optimism to the American people who in the late 1970's were dispirited. These three historic proceedings successfully improved American prosperity and peace through strength, elevating Reagan’s presidency to that of American exceptionalism.
The high percentages of individuals who endure this impairment justifies and practically demands future research because the causes are not fully understood. The need for future research can be better emphasized if those with normal vision try to empathize with victims of macular degeneration. One can only imagine how frustrating it must be to receive sensatrions only in the periphery of the retina. Because the macula encompassed the cone rich fovea, which is used to focus on objects, the fovea degenerates as well. This occurence inables individuals to interpret the sensations they experience. Reading, ...
SUMMARY: Chlamydia trachomatis is one the most prevalent bacteria that found in patients with Sexually Transmitted Infections (STIs), which almost represent asymptomatic in society. Two hundred sixty urine samples of women in two groups (symptomatic and asymptomatic) were collected from patients attending STI clinic at Mehrad hospital in Tehran and tested by polymerase chain reaction (PCR) for the presence of C. trachomatis DNA. A total of 39 women in both group were infected (14.99%), which 27/130 person of them were in symptomatic group (20.76%), compared with 12/130 person in asymptomatic group (9.23%). A significant association was seen between C. trachomatis infections with history of STIs in both groups dependently and with urinary variable parameters such as WBC in each group independently, and with epithelial cells just in symptomatic women. The present study shows that screening strategies for chlamydial infections as part of routine investigations, especially in-married symptomatic women are
Sajda P. & Finkle, L.H. (1995) Intermediate Visual Representations and the Construction of Surface Perception. Journal of Cognitive Neuroscience, 7, 267-291.
In “The Anatomy of Judgmen”t, M. L. J. Abercrombie discusses how information is gained through our perception. Abercrombie claims that interpretation is a very complicated task that people have been learning to exercise since birth. Each person has a different way of interpreting the objects or situations they see, because people often relate their own past experiences. She also explains two important concepts: schemata and context. She defines schemata as a way our mind functions by understanding new things perceived through sight, by relating it to an individual’s past experiences. Past experiences help interpret what is seen further, if the object fits one’s expectation or their schemata, and not something different from their past experiences. Her fundamental insight is that seeing is more complex than just passively registering what is seen, and consists of a form judgment for...
A recent neurobiological approach to understanding consciousness, at least on a perceptual level, has involved the study of the phenomenon of blindsight. Damage to areas of the visual cortex often result in complete or partial blindness. Although the eye itself is undamaged, patients report an inability to detect any light input in part of (or the entire) visual field. However, experiments regularly show that somehow, visual cues are processed. Visual inputs presented to the blind field affect the patient's response to stimulus in the normal visual field. Reaction times to stimuli are affected as well as the interpretation of the stimuli. A visual cues presented in the blind field may suggest a certain interpretation of an ambiguous stimuli. For example, the interpretation of the word "bank", presented as an auditory cue, differs depending on whether the word "river" or "money" is presented to the blind field, even though the patient does not...
Some other causes of the infection include different sexual partners, and holding back the urge to urinate. Others such as renal stones and tumors are very seldom.
The human sense of sight is a very detailed and complex ability, which humans often take for granted. However, once they take time to think about it, they realize how complicated the process really is. The eye receives light from the outside with the cornea, which then travels through the nerves until the light reaches the brain. The brain processes this light into information about the outside world, and then the brain uses this information to decide how to respond. All this happens in less than half a second.(Robertson, 2012) The used information is then stored inside the brain for safekeeping in memories, though some images may still influence a person’s thoughts. The brain is the central hub for a person, used to give commands and store emotions felt, as well as many other uses. It is the most important organ in the body, and influences what the images sent from the eye are translated into.
Michael Tye comments that, “Viewers of [a] painting can apprehend not only its content... but also the colors, shapes, and spatial relations obtaining among the blobs of paint on the canvas.” In this sense, qualia explains how humans can understand and recognize images on an everyday basis. If a person that had never seen a tree before was shown a drawing of a brown rectangle with a green circle attached to the top, the image would be foreign and unrecognizable. However, if a person had seen a tree before and was given the same drawing, they would recognize the general shape and colors of the image and assume it was a tree. By giving objects and experiences distinct, subjective qualia, images become recognizable and organized in the
The next one is Chlamydia it is the most common reported STI in the United Sates. (Greenberg, Bruess, & Oswalt, 2014) Believe it or not but it is caused by a intracellular parasite and symptoms very causing discomfort using the restroom and discharge. To diagnose chlamydia, a layer of cells is scraped from the infected area or a urine sample can be tested. (Greenberg, Bruess, & Oswalt, 2014)
Williams, F., & McShane, M. (2010). Criminological Theory, (5th Edition). New Brunswick, New Jersey: Prentice-Hall.
"What our eyes can't see, the brain fills in." Phys.org. Science X, 4 Apr. 2011. Web. 7 Apr. 2014. .