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Hemispatial Neglect

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. Hemispatial Neglect. E.g. line bisection task.

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Hemispatial Neglect

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  1. 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

  2. Hemispatial Neglect • E.g. line bisection task

  3. Hemispatial Neglect • E.g. reproducing visual forms

  4. 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

  5. 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

  6. 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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