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First of all the visual implies the ability to detect light and the possibilities of interpretation. First stimulus image is formed in the retina and are the cells that comprise the other cells of the retina, photoreceptors, which are responsible for capturing the light, then, are responsible for transform this light into electrochemical impulses and transport them to the optic nerve and from there to the regions of the brain that are task end of decoding and the subsequent construction of distances movements, colors, and shapes of the objects that surround us and enter our visual.
The vision uses and uses numerous sources of information to interpret and get idea of the world that surrounds us. For example, using the eyes or also called binocular vision is that allows us to determine the distance of one object or to distinguish between different movements, such as the typical movement of an animal as the cat and the movement that stars in this one, but with a background garden and some prey in its mouth.
Although the formal study of the visual began in century XIX thanks to the contribution of scholars such as Hermann von Helmholtz, responsible for the first experiments and psychophysical methods which tried to shed light on issues such as which they mentioned above, would not be until the 20th century, when the German Gestalt school starts to stomp , which you will discover that the vision is also strongly guided by processes involving a tour of up-down and by phenomena such as humans we tend to complete those images presented to us as incomplete before our visual.
Article contributed by the team of collaborators.