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Temporal dynamics of daylight perception: Detection thresholds.

Ruben Pastilha1,2, Gaurav Gupta1,3, Naomi Gross1,4

  • 1Neuroscience, Institute of Biosciences, Newcastle University, Newcastle upon Tyne, UK.

Journal of Vision
|December 29, 2020
PubMed
Summary
This summary is machine-generated.

Human perception of changing light is biased. We found that changes in light color are less noticeable when shifting towards neutral, suggesting natural light variations are often imperceptible.

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Area of Science:

  • Visual perception
  • Color science
  • Photometry

Background:

  • Temporal changes in illumination, such as natural daylight, are common but human sensitivity to these spectral shifts is not well understood.
  • Understanding perception of illumination changes is crucial for fields like lighting design, visual display technology, and understanding color constancy.

Purpose of the Study:

  • To quantify human sensitivity to temporal changes in illumination spectra.
  • To determine the minimum detectable velocity of chromaticity change for daylight simulations.

Main Methods:

  • Participants (n=22) were exposed to simulated daylight (metamers) with controlled chromaticity changes in an immersive environment.
  • Stimuli involved monotonic shifts in correlated color temperature (CCT) along the daylight locus, from various adapting base lights (2000K to 13,000K).
  • Detection thresholds were measured in CIELUV ΔE units for a fixed 10-second duration.

Main Results:

  • Detection thresholds varied significantly with the base light CCT, ranging from 2 to 15 CIELUV ΔE.
  • A significant interaction between CCT and direction of change was observed: shifts towards neutral were less detectable with warmer base lights, and vice versa.
  • Sensitivity to chromaticity change was significantly lower when shifting towards neutral compared to away from neutral for extreme base lights.

Conclusions:

  • Human visual perception exhibits a 'neutral bias' in discriminating illumination changes.
  • Typical temporal variations in natural daylight chromaticity may fall below the threshold of human detectability, especially without concurrent illuminance changes.
  • This perceptual stability likely contributes to the constancy of perceived colors and natural scenes under varying light conditions.