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Multimodal spatial orientation deficits in left-sided visual neglect.

G Kerkhoff1

  • 1EKN, Clinical Neuropsychology Research Group, Krankenhaus Bogenhausen, München, Germany. ekn@extern.lrz-muenchen.de

Neuropsychologia
|December 22, 1999
PubMed
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Patients with neglect exhibit multisensory spatial orientation deficits, affecting visual and tactile judgments in the frontal plane. These impairments correlate with neglect severity and impact ambulation, suggesting a link to postural control.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visuospatial Processing

Background:

  • Contralesional neglect, often associated with right temporo-parietal lesions, typically manifests as horizontal plane deficits.
  • Previous research indicated spatial-perceptual deficits beyond horizontal plane assessments, including subjective visual vertical/horizontal judgments.
  • A prior study found significant perturbations in visual spatial axes perception in patients with neglect from parietal lesions.

Purpose of the Study:

  • To investigate if spatial-perceptual deficits in neglect extend to tactile modalities in the frontal plane.
  • To assess visual- and tactile-spatial judgments of axis orientation in patients with and without neglect, and in normal subjects.
  • To explore the relationship between spatial orientation deficits, neglect severity, ambulation, and head position.

Related Experiment Videos

Main Methods:

  • Evaluated visual-spatial and tactile-spatial judgments of subjective vertical, horizontal, and oblique orientations.
  • Compared performance between patients with neglect (left or right hemisphere lesions), control patients without neglect, and healthy subjects.
  • Assessed correlations between spatial orientation deficits, clinical neglect severity, and ambulation performance. Examined effects of head tilt on spatial judgments.

Main Results:

  • Patients with left neglect showed significant contraversive (counterclockwise) tilts in both visual-spatial (+5.6 to +9.5 degrees) and tactile-spatial (+5.2 to +10.5 degrees) judgments.
  • Control groups (without neglect) exhibited unimpaired judgments (constant errors < 1.0 degree).
  • Neglect patients displayed elevated difference thresholds (visual) and unsigned errors (tactile), with deficits correlating significantly with neglect severity and ambulation.

Conclusions:

  • Neglect patients exhibit multisensory spatial orientation deficits affecting visual and tactile modalities in the frontal plane.
  • These deficits are modulated by head position, suggesting gravitational input influences spatial judgments in neglect.
  • The findings link spatial orientation impairments to postural control and ambulation deficits in neglect patients.