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Related Experiment Videos

Simultanagnosia: when a rose is not red.

H Branch Coslett1, Grace Lie

  • 1Department of Neurology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA. hbc@mail.med.upenn.edu

Journal of Cognitive Neuroscience
|October 9, 2007
PubMed
Summary
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Visual processing normally links object identity and location. A patient with posterior parietal damage could not process multiple objects or object attributes, suggesting this binding is crucial for conscious awareness.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Visual processing typically segregates information about object identity (

Observation:

  • A patient with simultanagnosia and bilateral posterior parietal infarcts could not perceive more than one object in an array.
  • This patient also exhibited an inability to report multiple attributes of a single object, a novel finding.

Findings:

  • The patient's visual processing deficits suggest that binding object identity and spatial location is a limited-capacity operation.
  • This binding process is essential for conscious awareness and critically involves the posterior parietal lobe.

Implications:

  • The findings highlight the posterior parietal lobe's role in integrating object identity and location for conscious visual perception.

Related Experiment Videos

  • This research sheds light on the neural mechanisms underlying visual awareness and object recognition.