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Attentional allocation and the pan-field color illusion
Lana Okubo1,2, Kazuhiko Yokosawa3,4
1Department of Psychology, The University of Tokyo, Japan.
Journal of Vision
|March 23, 2023
Summary
The pan-field color illusion, where we see color everywhere, isn't just due to reduced attention in peripheral vision. Our study suggests a bias towards perceiving color in the periphery also contributes significantly.
Area of Science:
- Visual Perception
- Cognitive Neuroscience
Background:
- Humans perceive scenes in full color across their entire visual field, known as pan-field color.
- This subjective experience contradicts the objectively limited color sensitivity in the peripheral visual field.
Purpose of the Study:
- To investigate how visual attention affects the pan-field color illusion.
- To determine if attentional allocation to the periphery influences color perception.
- To differentiate the roles of sensitivity and response bias in this illusion.
Main Methods:
- Utilized "chimera" stimuli with central color and achromatic peripheries.
- Employed a dual-task paradigm to manipulate foveal attentional load.
- Analyzed sensitivity and response bias in judging image color content.
Main Results:
- Attentional load modulated sensitivity in the peripheral visual field.
- Response bias was influenced by the size of the central colored area and eccentricity.
- Perception of color in the periphery increased with the size of the central colored area.
Conclusions:
- The pan-field color illusion is not solely explained by attention-modulated sensitivity decreases in the periphery.
- Results suggest a liberal response bias in peripheral vision plays a crucial role in the pan-field color illusion.
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