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Aphasia - Week 6
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30
Other
Graduate
02/19/2009

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Term
alexia is
Definition
an acquired disturbance in reading; a loss or impairment of the ability to comprehend written or printed language caused by brain damage
Term
dyslexia
Definition
is a developmental disorder manifested by difficulties to learning to read despite conventional instruction, adequate intelligence, and sociocultural opportunity. It is dependent on fundamental cognitive disabilities which are frequently of constitutional origin
Term
fundamental knowledge of alexia is thanks to:
Definition
Dejerine
Term
2 major types of alexia:
Definition
alexia with agraphia and alexia without agraphia
Term
alexia without agraphia is also called:
Definition
pure alexia, occipital alexia, agnosic alexia, posterior alexia, word-blindness, verbal alexia, letter-by-letter reading
Term
where is the damage for pure alexia?
Definition
left mesial occipital damage
Term
alexia w/out agraphia (major symptoms)
Definition
dissociation between ability to read and to write; letter-by letter reading; normal writing; derivational (morphological) paralexias -> taking take); correct spelling; ability to change the type of letter. (can read letters)
Term
alexia with agraphia (aka)
Definition
parietal-temporal alexia, central alexia, literal alexia, apasic alexia, letter blindness
Term
alexia with agraphia
Definition
inability to read letters (total alexia); copying is better than spontaneous writing; inability to change the type of letter from upper to lower case; reading other symbolic systems (e.g., numbers) is also impaired
Term
kids with dyslexia have damage near...
Definition
the angular gyrus
Term
Spatial Alexia (aka)
Definition
visuospatial alexia; neglect alexia
Term
spatial alexia (symptoms)
Definition
asymmetric reading; difficulties in the spatial recognition of letters; left hemi-spatial neglect; complete's/confabulates/guesses what words are; mirror-letter difficulty; inability to follow a text; grouping and fragmenting
Term
errors noted in spatial alexia
Definition
errors in reading letters; literal substitutions; syllables and pseudowords substitutions; letter additions and omissions; hemispacial neglect; confabulation in words; word splitting
Term
Frontal alexia (aka)
Definition
anterior alexia, broca aphasia alexia
Term
frontal alexia (characteristics)
Definition
reading understanding is better than reading aloud; meaningful words; errors are similar to spoken language errors; agrammatic reading; verbal reading is better than literal reading
Term
aphasia alexias
Definition
in general, aphasic patients present defects in reading as a result of their linguistic defect
Term
alexia for braille
Definition
in blind people has been observed in cases of bilateral or right occipital lesions
Term
kinesthetic alexia
Definition
inability to read following the letters with the fingers with a normal visual reading has been reported in left parietal damage
Term
up to now we have been talking about
Definition
the classical interpretation of alexia (aka anatomically or neurologically based alexia)
Term
Psycholinguistic models of alexia
Definition
emphasis changes from the anatomical correlates to the functional mechanisms of alexias
Term
hemialexia
Definition
cutting the splenium of the corpus callosum without associated occipital damage. Difficulties with reading the info presented in the left visual field
Term
A model for normal reading is proposed:
Definition
two routes
Term
direct route
Definition
written word is associated with the representation of the word in memory
Term
indirect route
Definition
written word is converted in a spoken word following certian graphophonemic rules. meaning is obtained using a phonological mediation.
Term
central alexias
Definition
the word is correctly recognized but there are defects in the semantic or phonologic processing of the word (phonological, surface, and deep alexia)
Term
peripheral alexias
Definition
defects in the correct recogognition of the word; eltter-by-letter reading; neglect reading; attentional alexia
Term
phonological alexia
Definition
indirect route (phono) impaired; direct (lexical) preserved; inability to read pseudowords; relative ability to read real words; frequency is crucial; visual paralexias are frequent
Term
surface (lexical) alexia
Definition
indirect route (phonological) preserved; direct route (lexical) impaired; reading regular words and pseudowords; regularization of irregular words.
Term
deep alexia
Definition
both routes are impaired and jsut some few residual abilities remain; semantic paralexias (lawyer -> attorney); grammatical category and imaginability; impossible to read pseudowords; morphological (derivational) paralexias; aphasia and agraphia always observed
Term
Reading ability in two writing systems can be dissociated
Definition
(e.g., syllabic Kana and logographic Kanji)
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