agraphia Flashcards
pure agraphia
acquired loss of writing skills following brain damage
agraphia is characterized by
errors in spelling, semantics, syntax, and poor formation of letters
agraphia occurs due to ___
language deficits NOT motor deficits
posterior aphasias are typically associated with
alexia and agraphia
central agraphia
deep, phonological, lexical, and surface
deep agraphia
difficulties in both spelling and meaning of words. more deficits for abstract nouns (wisdom, happiness) and grammatical functor words
-associated with damage to perisylvian language areas (brocas, wernickes, and supramarginal gyrus)
*most severe form of central agraphia
phonological agraphia
difficulties in sounding out words with relative preservation of ability to write real words. associated with damage to perisylvian areas
ex: school -> skool, pneumonia -> newmonia
lexical agraphia
difficulties in visualizing spellings of words with relative preservation of sounding them out (intact phonological rules). more errors for uncommon words. lesions of left extrasylvian temporo-parietal regions
surface agraphia
characterized by loss of orthographic rules and spelling is performed based on phonological knowledge (ex. coff for cough). tend to be more mild
peripheral agraphias
allographic disorders, apraxic agraphias, nonapraxic agraphia
allographic disorders
associated with damage to left pariet-occipital region. people may have inability to active or select approropriate letters shapes with relatively intact oral spelling. have difficulties with upper and lowercase letters or produce case-mixing errors (pApeR)
-letters that look similar may get switched (b->d, p->q, m->w)
apraxic agraphia
peripheral agraphia due to damage of graphic motor programs
-poor letter formation
-typical errors may include spatial distortions, illegible handwriting
-seen in people with aphasia and apraxia
-space between letters is inconsistent
nonapraxic agraphia
characterized by deficits in kinematic parameters of handwriting (movement, force, speed, amplitude)
-micrographia: very small and illegible handwriting
-occurs due to dysfunction of the nueral system controlling writing (parietal, supramarginal gyrus)
assessment of writing skills
-graphomotor vs. lingustic writing skills
-automatic writing vs. propositional writing skills
-written confrontation naming versus writing to dictation
-narrative writing
-functional writing
graphomotor vs. lingustic writing skills
look through samples for both quantitative and qualitative aspects. make notes about contect, words used, type and frequency of errors, letter formation, and self-correction attempts