Illumination assumptions account for individual differences in the perceptual interpretation of a profoundly ambiguous stimulus in the color domain: "The dress".
Level 4 - case-series / case-control
Cross-sectional online survey of subjective perception
PubMed 28388701 · doi:10.1167/17.4.5
What was done
An online survey was conducted with approximately 13,000 observers to assess their subjective color interpretation of "the dress" stimulus. Researchers evaluated how perceptions correlated with observer assumptions regarding illumination (natural vs. artificial light, or being in shadow), demographic factors (age, gender), and circadian type affecting prior exposure to long- versus short-wavelength light.
What was found
The abstract reports no numerical values, effect sizes, or test statistics. It notes that assumptions about the illumination of the dress strongly affected subjective interpretations relative to demographic factors (age and gender), which had smaller influences. Circadian type also shaped the percept in theoretically expected ways within a Bayesian framework.
Why it matters
This study provides large-scale empirical evidence that individual differences in the interpretation of an ambiguous color stimulus are primarily explained by prior assumptions about scene illumination and environmental light exposure rather than basic demographics.
Limits
The abstract reports no exact numbers, confidence intervals, or p-values. The online survey design lacks stimulus display calibration, controlled laboratory lighting, and objective verification of circadian exposure or participant responses.