A form of blindness where you can see everything, but recognize nothing

Most of us have had an experience like this : we turn our heads to the side in bed and see a strange shape . It has a weird assembly line to it , and it ’s an leftover color , and it ’s suspend in a strange way . We ’re wary . We ’re confused . Whatever we ’re experiencing does n’t ‘ ring a toll , ’ for us . And then we turn our heads slightly , and recognition dayspring . That thing we ’re seeing was the fringed scarf joint that we take over from someone last night for the walk home through the rain . It ’s in that uncanny position because we hung it between the desk and the doorknob to dry out .

When we consist back down , most of us keep this sense of recognition . Now that we know what it is , we can see and empathise the style the scarf moves in the draft from under the door . Now that we know what we ’re ‘ face ’ for , we can see it clearly . We can recognize it the way we recognize everything else in our sprightliness . But people with a syndrome called agnosia do n’t have this continued acknowledgment . The second the object goes away , it goes back to being foreign .

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General Visual Agnosia

There are many different type of agnosia . All are triggered by injury , tumors , or diagonal , and all represent small slice of personal blindness . Not an absolute cecity to the sight , but a cecity to the memory of the sight , an unfitness to see things you ’ve examine many sentence before . A modest hit , a small tumor , or a pocket-sized cerebrovascular accident , and your mind can simply wipe out your ability to recognise anything .

This was the unwellness of the famous human who misidentify his married woman for a lid . General agnosics are able to see just o.k. , but the matter they see are a welter of human body and colors . The homo described seeing a deep reddened conglomeration of shapes , clustered around a center , with a narrow green line hanging beneath it . Some masses reading this might spot the red and green object as a rose . The man never did . When he get up to go , the world stand up and looked for his hat . His still - seated wife , with her even , rotund , roughly drumhead - shaped coiffure , looked enough like his hat for him to grab at her read/write head , attempt to find fault up his hat to put it on .

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Not all visual agnosia is that all - encompasing . An injury can take out the ability to recognize anything , or it can slice away realisation in section . Dorsal simultanagnosia , for example , can take aside your ability to see more than one affair at the same time . Show a someone a melodic phrase drawing of three different objects superimposed , and they will capture on one and be unable to describe the rest . Color agnosics ca n’t recognize that , for object lesson , a unripe cow is an unusual hue . Topographical agnosia soak masses of the ability to countenance their visual clue guide their management . A topographical agnosic can narrate you that the table is to the left , but ca n’t get there . Category - specific agnosia patient ca n’t distinguish one group of objects from another , even dim-witted distinctions like living things from nonliving thing . A table and a cat are every bit probable to be live to them . Any ability to coordinate between get a line the incoming photons and responding to them can be learn away .

Prospagnosia

The most famed of agnosias is prosopagnosia , or face - blindness . This is also the only type of agnosia that can be ‘ ascertain . ’ Everyone has a department of the learning ability , the fusiform convolution , that deals with facial recognition . If that is damaged , recognition is gone . This department , however , needs stimulation and practice at several key stages of development to be of any use . Babies born with cataracts , which often ca n’t be move out until six to eight months in , are fount blind . Children who have been blinded and do n’t get their spate back until maturity are often face blind . It ’s thought that some children who are overlook , and ineffective to see a parent ’s side responding to their own , can become face unreasoning .

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Face blindness is often so insidious that Heather Sellers , who had such an intense case that she wrote a memoir about it entitle You Do n’t Look Like Anyone I get it on , did n’t realize she was aspect - blind until her thirties . Face cecity is n’t , harmonize to her book , the blankness that most citizenry assume it is . Most of the time , when someone was in her boss ’s post , put on her boss ’s clothes , verbalise like her boss and with her political boss ’s animalism , she figured out it was her boss so speedily that she never noticed not realise the aspect . She saw confront , like anyone else , and if she occasionally blank out a side , or mistook one person for another , or walked by someone in the street without recognize them , well , who did n’t ?

When she postulate her young man to encounter her mother , she managed to walk by her own female parent in a foodstuff store on the way to the house . When her swain recognized her mother from the grocery store once they cause to the family , Sellers thought he was chaff , and then brush the whole incident off . later on , when she make a typeface blindness tryout , which showed a picture of a typeface with the hair and the capitulum graze out , she did n’t recognize it as the quizzer sitting justly in front of her . look unreasoning people sometimes recognize who they ’re tattle to , and sometimes they do n’t , depending on if the person they ’re recognizing are in a familiar context , have the same hair , and whether or not the crowd around them is big . fulfill a nerve blind someone for lunch in their office staff , and they ’ll recognize you . Ask them to encounter in a bunch , and you might as well be asking them to blame out one Pisces from a whole school streaming past . Sellers stresses that the worst part of the circumstance is n’t the small misunderstanding , although those can be disastrous , but the accumulative effect . One misunderstanding after another racks up until the individual is in a unremitting state of matter of wondering if they know this person , or the next soul , or the next .

Topoagnosia and Astereognosia : Tactile Agnosia

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There ’s an onetime joke that blend in like this : A man fall into a doctor ’s power . He say , “ Doctor , I remember something is really wrong with me . When I touch my peg it injure and when I touch my stomach it suffer and when I touch on my head it hurts . No matter what I meet , it hurts ! ” The Doctor of the Church look at him , call forth an eyebrow , and says , “ Your bridge player is break . ” topognosia is the ability to tell which part of the trunk is being touch on . Topoagnosics have no ability , without attend , to understand what part of their consistence is being touched at any particular sentence . A pain can come because their hired man is on the stove , or because their shoes are too tight .

Astereognosia negates mass ’s ability to recognize what they ’re touching . Although they may be able-bodied to line the points of it – proceed back to a rose , they can tell apart a long stiff stick with points on it leading to fragile , soft canvass pile on top of each other – but they ca n’t realise what the objective is unless they can see it . The feel of object does n’t produce a memory board that can be accessed and compared to whatever they ’re touching . Every sensation is a new wiz , and a strange one .

And it ’s that eonian newness and strangeness that characterize all agnosias . Whether it ’s forecast out that , to go to the threshold on the leftfield you have to turn your feet in a sure path , despite having gone to that room access on the left over mass of time , or if you need to figure out each day if that person waving to you on the street is your mother with a raw haircut or a crazy someone fixated on you . Agnosics can see , can get a line , can know , can admit , but they can not fall back into the shape that most of us can use to navigate our means through the world . enlist freshly with the existence every time you encounter it has an allure . You never look at a flower as ‘ just another rose , ’ if it ’s an object of mystery from the first glance until you ultimately enter it out , but the drawbacks are ego - evident . There ’s little - to - no cross between the agnosic world and the so - called ‘ normal ’ world . Taking a look at the dispute as described to us , though , lets us see exactly how much we rely on what we ’ve run into before to understand what we ’re run across now . We live our spirit by establishing unconscious patterns – now we see what happens when those patterns are rive away .

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