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Ambiguous figures and binding: EEG frequency modulations during multistable perception.

Werner Ehm1, Michael Bach, Jürgen Kornmeier

  • 1Institute for Frontier Areas of Psychology and Mental Health, Freiburg, Germany Universitäts-Augenklinik, Freiburg, Germany.

Psychophysiology
|August 28, 2010
PubMed
Summary
This summary is machine-generated.

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Sudden perceptual shifts in ambiguous figures are linked to brain activity changes. A specific right-hemispheric gamma wave precedes these shifts, suggesting a brain state ready for change.

Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Visual Perception

Background:

  • Ambiguous figures trigger spontaneous perceptual reversals.
  • Understanding the neural basis of these perceptual shifts is crucial for cognitive science.

Purpose of the Study:

  • To investigate electroencephalogram (EEG) frequency modulations related to perceptual change and binding processes.
  • To identify the temporal sequence of neural events preceding and following perceptual reversals.

Main Methods:

  • Discontinuous stimulus presentation synchronized perceptual reversals with stimulus onset for precise temporal analysis.
  • Time-frequency analysis of EEG data was used to examine oscillatory activity.
  • Comparison between endogenous (spontaneous) and exogenous (stimulus-driven) reversals.

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Applications of EEG Neuroimaging Data: Event-related Potentials, Spectral Power, and Multiscale Entropy
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Related Experiment Videos

Last Updated: Jun 9, 2026

Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography
09:25

Detecting Pre-Stimulus Source-Level Effects on Object Perception with Magnetoencephalography

Published on: July 26, 2019

Applications of EEG Neuroimaging Data: Event-related Potentials, Spectral Power, and Multiscale Entropy
11:15

Applications of EEG Neuroimaging Data: Event-related Potentials, Spectral Power, and Multiscale Entropy

Published on: June 27, 2013

Main Results:

  • A significant right-hemispheric gamma-band modulation was observed approximately 200 ms before endogenous perceptual reversals.
  • This gamma modulation was absent in exogenously induced reversals of unambiguous stimuli.
  • Neural activity following stimulus onset was delayed for ambiguous figures compared to unambiguous ones.
  • The observed oscillatory activity patterns differed from predictions based on current binding theories.

Conclusions:

  • The preceding gamma modulation may reflect a preparatory neural state of heightened instability, facilitating perceptual switching.
  • The findings challenge existing models of perceptual binding and suggest novel mechanisms for perceptual change.