NESC 3227 Lecture Notes - Apraxia, Depth Perception, Lobectomy

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Published on 17 Apr 2013
School
Dalhousie University
Department
Neuroscience
Course
NESC 3227
Professor
March 5th, 2013
March-05-13
1:01 PM
Be sure to know table 21.2
Space perception and laterality
Space perception is understanding what's around you in space
Kosslyn was the first to describe a laterality in space perception between the two hemispheres
Lateral specialization of two kinds of spatial relations
Categorical information
o Left hemisphere
o Has more to do with verbal labelling
o Trying to understand where objects are in space relative to other things in space
o We have groupings of location that delineate patches of space (left of, right of, on top of)
o Discovers boundaries that separate bins of space
o Is relative and abstract
Coordinate means
o Right hemisphere
o Angles and distances between two points
o Uses concrete rather than abstract distances
o These calculation allow us to localize a stimulus precisely in space
Location of single point in space
Warrington's visual object space perception battery (VOSP)
o Given a stimulus which they have to match to whichever number is associated with it
o To say exactly where it is located, not to the right or left of
o Right hemisphere important in this because precise location involved
Same or different location in the box
A more categorical task, therefore you use your left hemisphere
Parietal lobe and constructional apraxias
If you're asked to draw a complex figure, you can't after left, right, or bilateral parietal lesion
Parietal lobe damage (Lang's study)
Categorical and coordinate systems were assessed
Individuals with either left or right hemisphere parietal lobe lesions
Individual had to look at a sample figure, then in test there was either a coordinate change
(distance decrease), categorical change (change in penguin direction), or both were manipulated
Left parietal lesion patients seemed to have more impairment in categorical changes than right,
only in errors, not reaction time
Right parietal lesion patients seemed to be more impaired in coordinate changes than left, again
only in errors
When both changes occurred, no group had more significant impairments over another
Conclusions
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Document Summary

Space perception is understanding what"s around you in space. Kosslyn was the first to describe a laterality in space perception between the two hemispheres. Lateral specialization of two kinds of spatial relations. Coordinate means: right hemisphere, angles and distances between two points, uses concrete rather than abstract distances, these calculation allow us to localize a stimulus precisely in space. A more categorical task, therefore you use your left hemisphere. If you"re asked to draw a complex figure, you can"t after left, right, or bilateral parietal lesion. Individuals with either left or right hemisphere parietal lobe lesions. Individual had to look at a sample figure, then in test there was either a coordinate change (distance decrease), categorical change (change in penguin direction), or both were manipulated. Left parietal lesion patients seemed to have more impairment in categorical changes than right, only in errors, not reaction time.

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