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Related Experiment Videos

Neglect of awareness

P W Halligan1, J C Marshall

  • 1Department of Experimental Psychology, University of Oxford, Oxford, United Kingdom.

Consciousness and Cognition
|October 27, 1998
PubMed
Summary

Left visuo-spatial neglect, a consequence of right hemisphere brain damage, causes patients to ignore the left side. This study highlights the crucial role of awareness and disconnection in understanding and treating this condition.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Neurology

Background:

  • Left visuo-spatial neglect is a common, severe, and persistent impairment following right hemisphere brain damage.
  • Patients exhibit an attentional bias towards the right, leading to an inability to respond to stimuli in the left (contralesional) space.
  • Understanding the subjective experience of neglect is crucial for comprehending its impact.

Purpose of the Study:

  • To describe the signs and symptoms of left visuo-spatial neglect.
  • To emphasize the patient's subjective experience of neglect.
  • To explore the role of awareness of contralesional space in neglect and its remediation.

Main Methods:

  • Clinical observation and description of signs and symptoms.
  • Analysis of patient experiences and subjective reports.
  • Investigation of the impact of cueing (local and global) on awareness of neglected space.

Main Results:

  • Patients with left neglect over-attend to the right, neglecting the left side of space.
  • Loss of awareness of left space is a critical feature, persisting even after cueing attempts.
  • Symptomology can be interpreted as a disconnection between local and global visual processing mechanisms.

Conclusions:

  • The persistent inability to consciously access left-sided perceptual information contributes to the difficulty in remediating left neglect.
  • A disconnection between specialized brain mechanisms for local and global processing underlies neglect.
  • Restoring conscious awareness of neglected space is key to overcoming attentional biases.

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