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Filling-in percepts produced by luminance modulation

M A Paradiso1, S Hahn

  • 1Department of Neuroscience, Brown University, Providence, RI 02912, USA. Michael_Paradiso@brown.edu

Vision Research
|September 1, 1996
PubMed
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Visual perception can create illusions where brightness appears to move inward or darkness spreads inward, especially with rapid light changes. This suggests a neural filling-in mechanism in the brain influences how we see brightness.

Area of Science:

  • Visual Neuroscience
  • Perception Psychology

Background:

  • Brightness perception is typically assumed to be uniform across a homogeneous visual field.
  • Rapid changes in light intensity can challenge simple models of visual processing.

Purpose of the Study:

  • To investigate the spatial uniformity of brightness perception during dynamic luminance changes.
  • To explore the role of neural mechanisms in brightness perception, particularly during luminance sweeps.

Main Methods:

  • Subjects viewed homogeneous spots of light with gradually increasing or decreasing luminance.
  • Luminance sweep durations and dwell times at each luminance step were systematically varied.
  • Experiments included stimuli presented to the optic disk to assess retinal and cortical contributions.

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Main Results:

  • Nonuniform brightness perception was observed, with brightness appearing to sweep inward during luminance increases and darkness inward during decreases.
  • These brightness filling effects were strongest with sweep durations of 0.25-0.5 seconds.
  • The effect was dependent on rapid luminance steps (<100 msec dwell time) and occurred even when the stimulus fell on the optic disk.

Conclusions:

  • The observed inward sweeping of brightness and darkness suggests a dynamic neural filling-in mechanism.
  • These findings support the hypothesis that a neural filling-in mechanism in the visual cortex is crucial for brightness perception.
  • The results challenge purely feedforward models of visual processing and highlight the active, constructive nature of perception.