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NESC 3227 (19)
Kim Good (19)

March 5th, 2013.docx

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Dalhousie University
NESC 3227
Kim Good

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 o Object space imperception and constructional apraxia are not a unitary syndrome resulting
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