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Mach bands explained by response normalization.

Frederick A A Kingdom1

  • 1McGill Vision Research, Department of Ophthalmology, McGill University Montreal, Quebec, Canada.

Frontiers in Human Neuroscience
|November 20, 2014
PubMed
Summary
This summary is machine-generated.

Mach bands are visual illusions explained by response normalization, a process adjusting visual channel gains locally. This simple model accounts for when these brightness illusions occur and when they do not.

Keywords:
Mach bandsbrightness illusionsfeature codingmulti-scale filteringresponse normalization

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Area of Science:

  • Visual perception
  • Neuroscience
  • Computational vision

Background:

  • Mach bands are illusory brightness variations at luminance gradients.
  • Historically explained by lateral inhibition and later by sparse coding or learned expectations.
  • Previous models struggled to explain the full range of Mach band phenomena.

Purpose of the Study:

  • To propose and validate response normalization as the primary mechanism behind Mach bands.
  • To demonstrate a simple model explaining the conditions for Mach band occurrence and absence.

Main Methods:

  • Developed a one-dimensional computational model based on response normalization.
  • Simulated the model under various luminance gradient conditions.
  • Compared model predictions with established psychophysical data on Mach bands.

Main Results:

  • Response normalization effectively explains the presence and absence of Mach bands.
  • The model accurately predicts the range of conditions under which Mach bands are perceived.
  • This mechanism offers a simpler explanation compared to previous theories.

Conclusions:

  • Mach bands are most simply explained by local response normalization in early visual channels.
  • This finding aligns with recent multi-scale filtering theories and physiological data.
  • Response normalization provides a unified account for Mach band phenomena.