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Blind Spot Seeing more than your eye does People generally assume that what you see is very much what your eye sees and reports In reality your brain fills in very substantially to the information it gets from your eye Pessoa Thompson Noe 2001 This means a good deal of what you see is made up by your brain Well how do we explain this filling in phenomenon Understanding the concept Blind Spot will be the first step to answering this question Blind spot is a small part of your retina where the optic nerve and blood supply for the retina enters the eye This position existing in both eyes is devoid of light receptors thus there is no vision possible at this point DurginTripathy Levi 1995 St James Schneider Rodgers 1997 However this region of visual field is never perceived to have a gap There are three apparent explanations for why no gap is generally noted Firstly since the two blind spots are in different field of vision if one eye does not see something the other one will St James et al 1997 Secondly the eyes also are in constant motion obtaining a complete version of every scene thus making the effect of blind spot negligible Bridgeman Vander Hejiden Velichkovsky 1994 The third approach involves psychological input What you see is something the brain is making up The region of the visual field corresponding to the blind spot appears to be filled in Durgin et al 1995 Ramachandran 1995 Pessoa et al 2001 argues that there is good evidence for neural filling in Other approaches to filling in concept suggests that the brain produces an internal representation of the world Dennett 1991 ORegan 1992 and that seeing is a way of acting ORegan Noe 2001 The phenomenon of filling in is the most common approach adopted by researchers in explaining no gap
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