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Related Experiment Videos

Masking disrupts reentrant processing in human visual cortex.

J J Fahrenfort1, H S Scholte, V A F Lamme

  • 1University of Amsterdam, Amsterdam, the Netherlands. j.j.fahrenfort@uva.nl

Journal of Cognitive Neuroscience
|August 24, 2007
PubMed
Summary
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Visual masking, which makes stimuli invisible, is explained by disrupted feedback connections. Electroencephalogram data shows feedforward processing remains intact, indicating masking interferes with reentrant processes crucial for visual awareness.

Area of Science:

  • Neuroscience
  • Cognitive Science
  • Visual Perception

Background:

  • Masking is a phenomenon where a stimulus becomes invisible due to a subsequent stimulus.
  • Traditional explanations involve early feedforward disruption of visual processing.
  • Recent theories suggest masking may involve interrupting cortico-cortical feedback connections.

Purpose of the Study:

  • To investigate the neural mechanisms underlying visual masking using electroencephalogram (EEG).
  • To differentiate between feedforward and feedback processing roles in masking.
  • To understand how masking affects visual awareness and figure-ground segmentation.

Main Methods:

  • Utilized electroencephalogram (EEG) measurements in humans.
  • Recorded brain activity during the detection of a texture-defined square under masked and nonmasked conditions.

Related Experiment Videos

  • Analyzed scalp surface Laplacian current source-density maps to assess visual cortex activity.

    • Main Results:

    • EEG derivatives associated with reentrant processing were absent in the masked (unseen) condition.
    • Extrastriate visual areas showed early activation for both seen and unseen stimuli.
    • Feedforward processing was preserved even when performance was at chance levels.

    Conclusions:

    • Masking effectiveness is partly due to the disruption of reentrant (feedback) processing.
    • This disruption interferes with neural mechanisms of figure-ground segmentation.
    • Masking impacts visual awareness by interrupting feedback loops in the visual cortex.