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Related Experiment Videos

Spatial hemineglect in back space

G Vallar1, C Guariglia, D Nico

  • 1Dipartimento di Psicologia, Università di Roma, La Sapienza, Italia.

Brain : a Journal of Neurology
|April 1, 1995
PubMed
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Patients with spatial hemineglect show a rightward shift in their perceived mid-sagittal plane. This suggests a pathological translation of their spatial coordinate system, impacting egocentric localization.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Clinical Neurology

Background:

  • Spatial hemineglect is a neurological disorder characterized by a deficit in attending to or perceiving stimuli on one side of space.
  • The subjective mid-sagittal plane is crucial for egocentric spatial representation and orientation.
  • Understanding the neural basis of spatial representation is key to diagnosing and treating neglect.

Purpose of the Study:

  • To investigate the subjective localization of the mid-sagittal plane in patients with and without spatial hemineglect.
  • To determine if spatial hemineglect is associated with a specific distortion of egocentric spatial reference frames.
  • To differentiate between translational and rotational models of spatial disorientation in hemineglect.

Main Methods:

Related Experiment Videos

  • Auditory localization tasks were used to assess the subjective mid-sagittal plane.
  • Participants included right brain-damaged patients with spatial hemineglect, right brain-damaged patients without hemineglect, and healthy controls.
  • Localization was tested in both front and back auditory half-spaces.

    • Main Results:

    • Patients with spatial hemineglect exhibited a significant rightward displacement of their subjective mid-sagittal plane in both auditory spaces.
    • Patients without hemineglect and controls showed minimal errors, with a leftward bias in the back half-space.
    • A subset of hemineglect patients displayed rightward displacement confined to either the front or back half-space.

    Conclusions:

    • The findings support a model of rightward, ipsilesional pathological translation of the egocentric coordinate system in spatial hemineglect.
    • This translational shift, rather than a rotational error, likely underlies the observed spatial disorientation.
    • The results have implications for understanding the neural mechanisms of spatial awareness and egocentric reference frames.