NESC 3227 Lecture Notes - Motor System, Parietal Lobe, General Idea

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Published on 17 Apr 2013
School
Dalhousie University
Department
Neuroscience
Course
NESC 3227
Professor
January 24th, 2013
January-24-13
1:03 PM
Lateralization of neglect
Spatial neglect is more common and more severe after right parietal lobe lesions
Localization of neglect
The inferior parietal region is the region that is most usually the most affected
A right hemisphere lesion will result in left visual field neglect
*visual field defects and neglect often occur together*
Very rare to see a pure lesion that leads only to neglect
Two frames of reference in visual spatial neglect
Viewer-centered
o Everything from the midline over in a person's field of view is no longer attended to
Object centered
o Defined by the object that is being viewed
o Map of NS example
Viewer centered neglect
So everything to one side of the fixation point is neglected
Changes to the orientation to the eyes, head and body
Object-centered neglect
So when looking at table, no matter how head positioned, one side still neglected
The neglected hand on the person is neglected whether head is pointing left or right
Most common type of neglect
Viewer-centered neglect is the most common kind
Sorting out viewer-centered vs object centered neglect
Give them a page full of whole circles and circles with gaps
Draw a circle around objects with full circle
Put x through ones with gaps
Patient one has viewer centered neglect
Patient two has object centered neglect
Mental maps also reveal neglect
Asked patients with right parietal lesions to imagine standing at the front door, looking towards
the cathedral piazza del duomo in florence italy
Were asked to draw the landmarks they see around the cathedral
o They were only able to come with up with images on the right visual field
Parietal lobe and constructional apraxias
Common after left or right, and bilateral parietal lobe lesions
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Document Summary

Spatial neglect is more common and more severe after right parietal lobe lesions. The inferior parietal region is the region that is most usually the most affected. A right hemisphere lesion will result in left visual field neglect. *visual field defects and neglect often occur together* Very rare to see a pure lesion that leads only to neglect. Two frames of reference in visual spatial neglect. Viewer-centered: everything from the midline over in a person"s field of view is no longer attended to. Object centered: defined by the object that is being viewed, map of ns example. So everything to one side of the fixation point is neglected. Changes to the orientation to the eyes, head and body. So when looking at table, no matter how head positioned, one side still neglected. The neglected hand on the person is neglected whether head is pointing left or right. Viewer-centered neglect is the most common kind.

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