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Measuring the Behavioral Effects of Intraocular Scatter

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Asymmetric Brightness Effects With Dark Versus Light Glare-Like Stimuli.

Yuki Kobayashi^1,2, Daniele Zavagno³, Kazunori Morikawa¹

¹School of Human Sciences, Osaka University, Osaka, Japan.

|March 19, 2021

Summary

Photometrical reversed glare (PRG) stimuli create a brightness illusion, making target areas appear brighter than they are. This visual perception phenomenon was consistently observed across multiple experiments.

Keywords:

glare effect lightness/brightness luminance gradient photometrical reversed glare simultaneous lightness contrast

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Area of Science:

Visual perception
Brightness illusions
Photometry

Background:

The glare effect is a known brightness illusion.
Photometrical reversed glare (PRG) stimuli, a variation of the glare effect, have been less explored.
Understanding PRG stimuli is crucial for advancing knowledge of visual perception.

Purpose of the Study:

To investigate the perceived brightness of target areas within PRG stimuli.
To compare the brightness illusion in PRG stimuli with conventional glare effect configurations.
To explore the impact of luminance gradients on perceived brightness in PRG stimuli.

Main Methods:

Three experiments were conducted to assess perceived brightness.
Experiment 1 used an adjustment task to measure target area brightness in PRG stimuli.
Experiments 2 and 3 employed a rating task to validate findings across various luminance conditions.

Main Results:

PRG stimuli consistently produced a robust brightening illusion in the target area.
The target area in PRG stimuli appeared brighter compared to control areas without luminance gradients.
This brightening effect was observed across a wide range of target and background luminance levels.

Conclusions:

PRG stimuli induce a significant brightening illusion, contrary to expectations based on pupil dilation effects.
The findings contribute to understanding how luminance gradients influence perceived brightness.
This research expands on the known glare effect by exploring its photometrical reversal.