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Visually presented [[Cognitive neuroscience of visual object recognition|object recognition]] is largely mediated by a hierarchical occipitotemporal pathway.<ref name="Ferreira" /> This pathway facilitates the distinction between regions allowing the processing of the visual features of objects. In addition the occipitoparietal pathway is sometimes damaged in apperceptive agnosia patients.{{Citation needed|date=May 2012}} Damage to this region leads to impairments in localization of visual stimuli.<ref name=Ferreira>{{cite journal|last=Ferreira|first=C.T.|author2=Ceccaldi, M|author3= Giusiano, B.|author4= Poncet, M.|title=Separate Visual Pathways for Perception of Actions and Objects: Evidence from A Case Apperceptive Agnosia|journal=J Neurol Neurosurg Psychiatryiatry|year=1998|volume=65|pages=382–385|doi=10.1136/jnnp.65.3.382|url= |issue=3|pmid=9728957|pmc=2170224}}</ref> |
Visually presented [[Cognitive neuroscience of visual object recognition|object recognition]] is largely mediated by a hierarchical occipitotemporal pathway.<ref name="Ferreira" /> This pathway facilitates the distinction between regions allowing the processing of the visual features of objects. In addition the occipitoparietal pathway is sometimes damaged in apperceptive agnosia patients.{{Citation needed|date=May 2012}} Damage to this region leads to impairments in localization of visual stimuli.<ref name=Ferreira>{{cite journal|last=Ferreira|first=C.T.|author2=Ceccaldi, M|author3= Giusiano, B.|author4= Poncet, M.|title=Separate Visual Pathways for Perception of Actions and Objects: Evidence from A Case Apperceptive Agnosia|journal=J Neurol Neurosurg Psychiatryiatry|year=1998|volume=65|pages=382–385|doi=10.1136/jnnp.65.3.382|url= |issue=3|pmid=9728957|pmc=2170224}}</ref> |
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== Theories of |
== Theories of Causation == |
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No two apperceptive agnosic patients are the same, but case studies have been used to make theories on what causes the object recognition deficits.{{Citation needed|date=May 2012}} While it is established that semantics plays a large role in apperceptive agnosia deficits, it is not agreed upon how semantics alter recognition processes. {{Citation needed|date=May 2012}}One theory proposes that semantic memories are divided into differential semantic categories. Brain damage leads to apperceptive agnosia because there is damage to a particular semantic category.{{Citation needed|date=May 2012}} Another theory, referred to as functional specialization, states that individual parts of the brain specialize in different tasks. According to this theory, if an area of the brain is damaged, the function that the area is responsible for may decline as well. Yet another theory suggests that the pattern of deficit arise from independent impairments to a particular input modality and a single non perceptual semantic system that is organized by category.{{Citation needed|date=May 2012}} Deficits are largely due to semantics, however many categories are related perceptually as well.<ref name="Renzi, E. 2000">{{cite journal | author = De Renzi E | year = 2000 | title = Disorder of Visual Recognition | journal = Seminars in Neurology | volume = 20 | issue = 4| pages = 479–485 | doi = 10.1055/s-2000-13181 | pmid = 11149704 }}</ref> Objects that are biologically similar are likely to have physical resemblance to each other as well.{{Citation needed|date=May 2012}} Evidence for this arises in the finding that perceptual confusion arises because of structural similarity contributes or accounts for some modality specific deficit.<ref name="Grossman" /> |
No two apperceptive agnosic patients are the same, but case studies have been used to make theories on what causes the object recognition deficits.{{Citation needed|date=May 2012}} While it is established that semantics plays a large role in apperceptive agnosia deficits, it is not agreed upon how semantics alter recognition processes. {{Citation needed|date=May 2012}}One theory proposes that semantic memories are divided into differential semantic categories. Brain damage leads to apperceptive agnosia because there is damage to a particular semantic category.{{Citation needed|date=May 2012}} Another theory, referred to as functional specialization, states that individual parts of the brain specialize in different tasks. According to this theory, if an area of the brain is damaged, the function that the area is responsible for may decline as well. Yet another theory suggests that the pattern of deficit arise from independent impairments to a particular input modality and a single non perceptual semantic system that is organized by category.{{Citation needed|date=May 2012}} Deficits are largely due to semantics, however many categories are related perceptually as well.<ref name="Renzi, E. 2000">{{cite journal | author = De Renzi E | year = 2000 | title = Disorder of Visual Recognition | journal = Seminars in Neurology | volume = 20 | issue = 4| pages = 479–485 | doi = 10.1055/s-2000-13181 | pmid = 11149704 }}</ref> Objects that are biologically similar are likely to have physical resemblance to each other as well.{{Citation needed|date=May 2012}} Evidence for this arises in the finding that perceptual confusion arises because of structural similarity contributes or accounts for some modality specific deficit.<ref name="Grossman" /> |
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