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Hemispatial Neglect Unilateral lesion to Parietal or Temporo- Parietal Junction Patients present with vision problems, but are not “blind” – Rather, they fail to apprehend (and interact appropriately with) stimuli in the contralesional field
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Hemispatial Neglect E.g. line bisection task
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Hemispatial Neglect E.g. reproducing visual forms
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Extinction Extinction is a more complicated aspect of neglect Patients fail to apprehend objects in the contralesional field when stimuli are present in the ipsilesional field
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Balint’s Syndrome Bilateral parietal lesions Patients fail to apprehend all but one of simultaneously presented objects at the same location Condition is object-based, not location-based – Multi-colored dots are properly seen if they are connected by lines
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Investigation of Neglect with Cue- Target Paradigm Posner et al. (late 1970s) used a cue- target paradigm Parietal Lobe patients are profoundly impaired only when invalidly cued to attended to the ipsilesional (good) side
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