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approach to apphasia - Coggle Diagram
approach to apphasia
Parietofrontal network for spatial orientation
introduction
damage to this network
hemispatial neglect , object finding failures and simultanagnosia
components
cortical
cigulate cortex
motivational mapping of extrapersonal space
posterior parietal cortex
senosrimotor representation of salient extrapersonal events
frontal eye fields
motor strategies for attentional behaviours
subcortical
thalamus
striatum
hemispatial neglect
hemispatial neglect
anatomy
right parietal lobe
directs attentiona to both left and right hemi space
lesion
left hemi neglect
as the left par. has no representation for directing attention to the left side
left Par. lobe
directs attention
only
to the right hemi space
lesion leads to no defect as Rt. Par. Lobe can compenstae
Right Par. damage more severe
clincial examination
ADL's
failure to dress , shave , groom the left side
failure to eat food placed on left side of tray
failure ot read left half of sentences, failure to copy line drawing(left side ) , writes with large margin on left
formal tests
visual target cancelation -motor component
FAILURE TO MARK TARGETS ON THE LEFT SIDE
hemianopia doesnt casue this as patient is free to move head
EXTINCTION
ON simultaneous bilateral stimulation
sensory
bilteral stimulation in the visual , tactile auditory modalities
patient unaware of left side stimulus, AKA EXTINCTION
Balint's syndrome and others
b/l lesion of parietal lobe
components
oculomotor apraxia
failure of orderly visuomotor scanning of enviornment
optic ataxia
failure of accurate manual reaching to visual targets
simultanagnosia
inability to integrate center of vision to enviornment or peripheral information
example- when looking at a forest only see's a tree
vanishing objects - as failure to redirect the center of vison to same point
on modified letter cancelation task - visual target cancellation , patient is unable to mark the larger targets
constructional apraxia
in RT Par. lesions
hemineglect
dressing apraxia
b/l par. lesion
impaired association of egocentric and allocentric inputs
causes
CVA
WATERSSHED INFARC , SAGITAL SINUS THROMB , HYPOGLYCEMIA
POSTERIOR CORTICAL ATROPHY
POROGRESSIVE spatial dissorientation , ? AD , prietooccipital cortex and sup collic.
Limbic network
Limbic system
Limbic area
Hippocampus
Amygdala
Entorhinal cortex
Paralimbic system
Cingulate gyrus
Insula
Temporopolar cortex
Parts of orbitofrontal region
Thalamus
Anterior and medial nuclei
Striatum
Medial and basal parts
Hypothalamus
Functions