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Flashcards in ch 14 parietal lobes Deck (38):

the parietal lobes

process and integrate somatosensory and visual info--what you feel with what you see, movement control


anatomy of parietal lobes

anterior border-central fissure
ventral border-sylvan fissure
dorsal-cingulate gyrus
posterior-parietooccipital sulcus
between frontal and occipital lobes, under parietal bone at skull roof


anterior zones process

somatic sensations and perceptions


posterior zones integrate

info from vision with somatosensory info for movement control (important to see to move)


use of spatial info: object recognition

viewer centered object indentification(where you are in space)--location, location orientation, and motion of an object
make computations everytime new movement made
brain operates on need to know basis
object centric-object compared to object


use of spatial info: guidance of movement

sensitive to eye movement, posterior parietal cortex, visuomotor guidance, cells detect visual ifo then move eye to examine it
dorsal stream-spatial processing


use of spatial info: sensorimotor transformation

neural calculations of relative position of the body with respect to sensory feedback from movements being made and planned
monkeys planned movement activity matched actual performance activity


spatial navigation requires

cognitive spatial map-route knowledge to reach destination and medial parietal region-neurons show responses associated with making specific movement at specific locatoin


3 symptoms of damage don't fit visuomotor view of parietal lobes

acalculia, language, movement sequencing


lesions to postcentral gyrus produce

abnormally high sensory thresholds, impaired position sense, deficits in stereogenisis/tactile perception, afferent paresis


somatoperceptual disorders-asterognosis

inability to recognize object by touch


somatoperceptual disorders-simultaneous extinction

2 stimuli applied simultaneously to opposite sides of body, failure to report stimulus on side with lesion (extinction)


somatoperceptual disorders-blind touch

cannot feel stimuli, but can point to location


somatoperceptual disorders-asomatognosia

type of agnosia, loss of knowledge or sense of one's own body, tactile perception disorder


somatoperceptual disorders-anosagnosia

type of agnosia, unawareness or denial of deficits


somatoperceptual disorders-anosodiaphoria

type of agnosia, indifference to deficits


somatoperceptual disorders-asymbolia for pain

type of agnosia, absence of normal pain reactions


somatoperceptual disorders-finger agnosia

type of agnosia, unable to point to fingers, show correct one


symptoms of posterior damage-balint's syndrome

can't fixate of visual stimulus, neglect of objects, optic ataxia (inability to guide hand to object using visual info)
bilateral lesions-full visual fields, could recognize, use and name objects pics and colors
move eyes 35-45 degrees to the right not fixating on specific stimuli
noticed 1 object at a time (simultagnosia)
reaching under visual guidance (visual ataxia)


symptoms of posterior damage-contralateral neglect

most often L neglect, neglect for visual, auditory, ans somesthetic stimulation
lesion mostly in R inferior lobe (intraparietal sulcus and angular gyrus)
during recovery patients go through allesthesia, respond to neglected stimuli as if it were on the other side of the body then simultaneous extinction
lesion to frontal lobe and cingulate cortex
defective sensation/perception
defective attention/orientation


symptoms of posterior damage-object recognition

r pari lesion, poor at recognizing objects in unfamiliar views


symptoms of posterior damage-Gerstmann Syndrome

finger agnosia, R-L confusion, agraphia, acalculia, L pari lobe lesion
L stroke-finger agnosia, R-L confusion, agraphia, acalculia
L lesion-angular gyrus-gerstmann syndrome not accurate


other L parietal symptoms-disturbed language functions

broca's, wernickes,


other L parietal symptoms-apraxa

movement disorder in which loss of movement not caused by weakness, inability to move, intellectual deterioration/poor, loss of skilled movement
ideomotor-can't copy serial movemelts, L lesions
constructional-cant copy pics, build puzzles, copy facial movements, L/R lesions


other L parietal symptoms-

dyscalculia, poor recall, inability to discriminate L from R, R hemianopia


symptoms of posterior parietal lobe

deficits in drawing (R), spatial attention


disorders of spatial cognition

mental rotation requires mental imaging of stimulus (L) and manipulation of image


principle regions

postcentral gyrus, superior parietal lobule, parietal operculum, supramarginal gyrus, angular gyrus
supramarginal and angular gyri=inferior parietal lobe


specifical parietal lobe regions take part in ____ stream of ____ processing

dorsal, visual



series of involuntary, rapid, small movements or jerks that are made by both eyes simultaneously in changing fixation point


drawing deficits

worse with R hemisphere damage,
drawings with L hemi damage less recognizable, less lines
R hemi omits left side details and rotates image


somatosensory threshold test

postcentral gyrus lesions-threshold increases on contralateral side
2 point discrimination test


tactile form recognition test

manipulate shapes in holes then draw from memory
no certain lesion location


contralateral neglect test

line bisection test (mark middle of 20 lines)
those with neglect miss L side


visual perception test

series of incomplete faces/objects presented, combine and identify (mooney closure/golin incomplete figures)
sensative to damage at R parietotemporal junction, ventral visual stream


spatial relations test

l/r differentiation tests-body parts presented at different orientations, indicate which side of body
L pari (and frontal) damage


language test

token test-4 shapes in 5 colors in front of person, touch 1 at a time then multiple, can read instructions aloud then follow
temporal speech related


apraxia test

kinura box test-push button with index fingers, pull handle with 4 fingers, press bar with thumb
apraxics perform poorly