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Related Experiment Videos

Space coding in primate posterior parietal cortex.

F Bremmer1, A Schlack, J R Duhamel

  • 1Allgemeine Zoologie & Neurobiologie, Ruhr-Universität Bochum, Germany. bremmer@neurobiologie.ruhr-uni-bochum.de

Neuroimage
|May 25, 2001
PubMed
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Patients with right parietal lesions show spatial attention deficits. Research suggests the ventral intraparietal area (VIP) integrates multisensory information in a head-centered frame, crucial for spatial perception.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neuropsychology

Background:

  • Lesions in the right frontal (premotor) or posterior parietal cortex cause sensorimotor attention deficits, including hemispatial neglect and extinction.
  • These deficits affect multiple sensory modalities and are often organized in head- or body-centered coordinates.
  • Neuropsychological data suggest a network of polymodal areas in primate premotor and parietal cortex represent spatial information in nonretinocentric frames.

Purpose of the Study:

  • To investigate the role of the ventral intraparietal area (VIP) in polymodal spatial perception.
  • To explore the functional implications of VIP lesions in parietal patients.
  • To identify the human equivalent of the monkey VIP area involved in processing motion information.

Main Methods:

Related Experiment Videos

  • Analysis of neuropsychological studies on patients with lesions in specific cortical areas.
  • Examination of neuronal responses in monkey area VIP to visual, tactile, vestibular, and auditory stimuli.
  • Review of functional imaging data in humans showing activation in the intraparietal sulcus.

Main Results:

  • Monkey area VIP contains neurons with polymodal, directionally selective responses to various stimuli.
  • These neurons encode sensory information in a common, likely head-centered, reference frame.
  • Human functional imaging reveals activation in the intraparietal sulcus, potentially corresponding to monkey VIP.

Conclusions:

  • The ventral intraparietal area (VIP) is a key node in a network for polymodal spatial perception.
  • VIP likely processes sensory information in a head-centered frame, contributing to spatial awareness.
  • Further research is needed to fully establish VIP's function in normals and the consequences of its lesions.