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Bistable perception -- along the processing chain from ambiguous visual input to a stable percept.

Jürgen Kornmeier1, Michael Bach

  • 1Sektion Funktionelle Sehforschung, Univ-Augenklinik Freiburg, Killianstr 5, Freiburg, Germany. juergen.kornmeier@uni-freiburg.de

International Journal of Psychophysiology : Official Journal of the International Organization of Psychophysiology
|July 1, 2006
PubMed
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Perceptual reversals in ambiguous figures involve early visual processing and later cognitive analysis. Event-related potential (ERP) findings suggest a P300-like component reflects cognitive analysis, not the reversal itself.

Area of Science:

  • Cognitive Neuroscience
  • Visual Perception
  • Psychophysics

Background:

  • Ambiguous figures elicit spontaneous perceptual reversals, with ongoing debate on top-down versus bottom-up explanations.
  • Previous event-related potential (ERP) studies show conflicting results, reporting either P300-like components or early visual ERPs related to reversals.

Purpose of the Study:

  • To investigate the temporal dynamics of perceptual reversals using high-resolution ERPs.
  • To compare endogenous Necker-cube reversals with exogenously-induced reversals of unambiguous stimuli.

Main Methods:

  • Employed an experimental paradigm with high temporal resolution to record ERPs during perceptual reversals.
  • Compared ERPs elicited by spontaneous Necker-cube reversals with ERPs from externally triggered reversals of unambiguous cubes.

Related Experiment Videos

  • Analyzed the timing of manual reactions in relation to ERP components.

    • Main Results:

    • An early occipital ERP component at 130 ms was specific to endogenous reversals.
    • Subsequent ERP components appeared in both reversal types but were 40–90 ms earlier in exogenous reversals.
    • Manual reaction times correlated with P300-like components, occurring 100–130 ms after them.

    Conclusions:

    • The P300-like component reflects cognitive analysis of the perceptual change, occurring approximately 300 ms after the initial visual representation change.
    • ERP chains integrate findings, indicating that top-down mechanisms influence perception after early visual processing.
    • Results reconcile conflicting ERP findings by differentiating between early visual processing and later cognitive interpretation of perceptual reversals.