Visual Information Essay -- Anatomy, The Retina

Visual discipline is seen because light passes through the cornea and is focussed by the lens as an inverted image on the retina (Ellis, 2004). The retina is imperturbable of photoreceptor cells rods and cones with the greatest density of cones situated within the fovea centralis centralis, thus vision is sharpest for images and information projected to the fovea (Ellis, 2004). Subsequently optic information of lateralized foveal stimuli projects to the intellectual cerebral hemisphere within the brain. In the brain, the unexpended visual hemifield projects to the a serious hemisphere and the right visual hemifield projects to the left hemisphere (Lavidor, Ellis, Shillcock & Bland, 2001). Generally for most individuals (in particular right handed), visual recognition of words and information is more efficient for debunk within the right visual field. However it is debated whether foveal information lateralized within the left or right visual field is double-projected to both he mispheres or one-sidedly projected to the contralateral hemisphere because the fovea is anatomically split and in that respect is differential contri aloneion of the two hemiretinae. Two theories have been put preceding regarding how visual information is projected to the hemispheres. According to the split fovea theory, hemispheric division in processes occurs right up to the point of fixation. When the eyes atomic number 18 fixated within a written word visual information most the letters falling to the left of fixation initially projects to the right cerebral hemisphere, whilst visual information about the letters falling to the right of fixation project to the left cerebral hemisphere. Foveal processing is split so only at the vertical midline that all letters at both side of fixation project (unilaterally) to th... ...occurring in foveal vision away from the midline however this is not visible or obvious when recognition of visual information occurs. There is an overl ap at the centre of the fovea where information projects simultaneously to both hemispheres, this being consistent with the bilateral theory. On the early(a) hand, split fovea theory is an interesting theory of fixation cause that has been inspired by previous research unconnected with split fovea theory and thus incapable of providing appropriate separate. More recently, split fovea theory has been based on experiments conducted specifically in its support but in which fixation locations were not monitored and stimuli exceeded foveal vision. It is good to see that research in the area is beginning to improve but it is difficult to be impatient about any theory when there is no compelling evidence to support it.