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In psychology, visual perception is the ability to interpret information from visible light reaching the eyes. The resulting perception is also known as eyesight, sight or vision. The various physiological components involved in vision are referred to collectively as the visual system.

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Wikipedia About Looking

In psychology, visual perception is the ability to interpret information from visible light reaching the eyes. The resulting perception is also known as eyesight, sight or vision. The various physiological components involved in vision are referred to collectively as the visual system.

Visual system

main: Visual system The visual system in humans allows individuals to assimilate information from the environment. The act of seeing starts when the lens of the eye focuses an image of its surroundings onto a light-sensitive membrane in the back of the eye, called the retina. The retina is actually part of the brain that is isolated to serve as a transducer for the conversion of patterns of light into neuronal signals. The lens of the eye focuses light on the photoreceptive cells of the retina, which detect the photons of light and respond by producing neural impulses. These signals are processed in a hierarchical fashion by different parts of the brain, from the retina to the lateral geniculate nucleus, to the primary and secondary visual cortex of the brain.

Study of visual perception

The major problem in visual perception is that what people see is not simply a translation of retinal stimuli (i.e., the image on the retina). Thus people interested in perception have long struggled to explain what visual processing does to create what we actually see.

Early studies on visual perception

There were two major ancient Greek schools, providing a primitive explanation of how vision is carried out in the body.

The first was the "emission theory" which maintained that vision occurs when rays emanate from the eyes and are intercepted by visual objects. If we saw an object directly it was by 'means of rays' coming out of the eyes and again falling on the object. A refracted image was, however, seen by 'means of rays' as well, which came out of the eyes, traversed through the air, and after refraction, fell on the visible object which was sighted as the result of the movement of the rays from the eye. This theory was championed by scholars like Euclid and Ptolemy and their followers.

The second school advocated the so called the 'intromission' approach which sees vision as coming from something entering the eyes representative of the object. With its main propagators Aristotle, Galen and their followers, this theory seems to have touched a little sense on what really vision is, but light did not play any role in this theory and it remained only a speculation lacking any experimental foundation.

Eye_Line_of_sight.jpg

Ibn al-Haytham (also known as Alhacen or Alhazen), the "father of optics", was the first to reconcile both schools of thought in his influential Book of Optics (1021). He argued that vision is due to light from objects entering the eye, and he developed an early scientific method emphasizing extensive experimentation in order to prove this. He pioneered the scientific study of the psychology of visual perception, being the first scientist to argue that vision occurs in the brain, rather than the eyes. He pointed out that personal experience has an effect on what people see and how they see, and that vision and perception are subjective. He explained possible errors in vision in detail, and as an example, describes how a small child with less experience may have more difficulty interpreting what he/she sees. For a little child however ugly a mother is , it does not matter to it as the definition of beauty is not that well defined for the little child as it is with any other adult . He also gives an example of an adult that can make mistakes in vision because of how one's experience suggests that he/she is seeing one thing, when he/she is really seeing something else.This can be easily related to the famous saying " Beauty lies in the eye of the beholder". That is a flower which may appear beautiful for one adult, may not appeal that much to the other.Bradley Steffens (2006). Ibn al-Haytham: First Scientist, Chapter 5. Morgan Reynolds Publishing. ISBN 1599350246. Al-Haytham carried out many investigations and experiments on visual perception, extended the work of Ptolemy on binocular vision, and commented on the anatomical works of Galen.

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Canadian Health Officials Looking for TB

FOX 2 News DetroitOntario public health officials are looking for 27 people who could have contracted tuberculosis during a Greyhound bus trip from Toronto to Detroit in late August. Dr. David Williams, Ontario's chief medical officer of health, said in a statement Thursday that a passenger on the bus had infectious tuberculosis and may have passed it on by coughing while in close contact with others.http://www.myfoxdetroit.com/myfox/pages/News/Detail?contentI...

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Anichebe police complaint probed

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Wikipedia results for Looking

Looking On - Wikipedia, the free encyclopedia

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Looking Glass" is a single/ EP by the Canadian rock band The Birthday Massacre. Unlike their previous single, Red Stars, the Looking Glass EP is a physical release rather than a ... http://en.wikipedia.org/wiki/Looking_Glass_EP

Looking for Group - Wikipedia, the free encyclopedia

Looking for Group is a fantasy-themed webcomic written by Ryan Sohmer and drawn by Lar DeSouza. The Comic follows the quest of Cale'Anon (an elven hunter) and Richard (an undead ... http://en.wikipedia.org/wiki/Looking_For_Group

Looking Backward - Wikipedia, the free encyclopedia

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Looking Up is the first full-length studio album by punk band Autopilot Off. It was released on June 27, 2000, on the Fueled By Ramen label. It is the band's first and last release ... http://en.wikipedia.org/wiki/Looking_Up
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