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Spatial frames of reference and somatosensory processing: a neuropsychological perspective

G Vallar1

  • 1Dipartimento di Psicologia, Università di Roma La Sapienza, Italy. givallar@imiucca.csi.unimi.it

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|November 22, 1997
PubMed
Summary

Right brain damage can cause higher-order somatosensory deficits due to impaired spatial body representation. These deficits, distinct from primary sensory issues, impact awareness and movement organization, particularly in left hemineglect patients.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Right hemisphere lesions, particularly in posterior parietal regions, can lead to left-sided somatosensory, visual, and motor deficits.
  • These deficits often involve a higher-order component related to defective spatial representation of the body, beyond primary sensory processing issues.
  • Contralesional hemianaesthesia, hemianopia, and hemiplegia are more prevalent in right brain-damaged (RBD) patients compared to left brain-damaged patients.

Purpose of the Study:

  • To investigate the existence and nature of a higher-order pathological factor contributing to somatosensory deficits in RBD patients.
  • To explore the relationship between spatial representation, body awareness, and somatosensory processing in neurological patients.
  • To examine how sensory stimulations affect spatial frames of reference and somatosensory deficits in RBD patients with left hemineglect.

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Main Methods:

  • Investigated RBD patients with left hemineglect for evidence of preserved, yet unaware, processing of somatosensory and visual stimuli.
  • Utilized direction-specific vestibular, visual optokinetic, and somatosensory/proprioceptive stimulations to assess spatial frames of reference.
  • Analyzed the impact of body segment position relative to the midsagittal plane on left somatosensory deficit severity.

Main Results:

  • RBD patients with left hemineglect showed preserved processing of stimuli they were not consciously aware of, indicating higher-order deficits.
  • Direction-specific stimulations could displace spatial frames of reference, altering directional errors and modulating somatosensory deficits and neglect symptoms.
  • The severity of left somatosensory deficits was influenced by the spatial position of body segments, suggesting non-somatotopic spatial representations.

Conclusions:

  • Spatial (non-somatotopic) levels of representation significantly contribute to corporeal awareness.
  • The posterior parietal and premotor frontal regions are crucial neural substrates for these spatial frames of reference.
  • These spatial representations likely serve as perceptual-premotor interfaces for organizing movements in personal and extrapersonal space.