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Related Experiment Videos

How does the brain sustain a visual percept?

C M Portas1, B A Strange, K J Friston

  • 1Wellcome Department of Cognitive Neurology, Institute of Neurology, London, UK. cportas@fil.ion.ucl.ac.uk

Proceedings. Biological Sciences
|June 15, 2000
PubMed
Summary
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Sustaining a visual percept involves the pre-frontal cortex and hippocampus, distinct from the brain regions active during initial perceptual synthesis. This finding highlights the role of memory systems in maintaining conscious visual experience.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Psychology

Background:

  • Perception transforms sensory stimuli into conscious experience.
  • Novel perceptions can be maintained or lost from awareness.
  • Understanding the neural basis of maintaining perceptions is crucial.

Purpose of the Study:

  • To differentiate neural responses during the onset versus maintenance of a visual percept.
  • To investigate the brain regions involved in sustaining conscious visual awareness.

Main Methods:

  • Event-related functional magnetic resonance imaging (fMRI) was employed.
  • Single-image, random-dot stereograms were used to generate percepts.
  • Neural activity was analyzed for onset and sustained phases of perception.

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Main Results:

  • Perceptual onset activated bilateral posterior thalamus, occipito-temporal, parietal, and frontal cortices.
  • Sustained perception was associated with activation in the pre-frontal cortex and hippocampus.
  • Distinct neural networks support perceptual synthesis and maintenance.

Conclusions:

  • Sustaining a visual percept engages memory-related neuroanatomical systems.
  • These systems are distinct from those involved in the initial synthesis of a percept.
  • This suggests a dual-process model for visual perception maintenance.