Temporal dynamics of daylight perception: Detection thresholds
| Autor: | Anya Hurlbert, Naomi Gross, Gaurav Gupta, Ruben Pastilha |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Adult
Male chromatic adaptation Light Global illumination Irradiance visual perception Color temperature Article 050105 experimental psychology Young Adult 03 medical and health sciences 0302 clinical medicine Optics Humans 0501 psychology and cognitive sciences Daylight Chromaticity daylight perception Physics detection thresholds Color Vision Color constancy business.industry 05 social sciences Illuminance temporal illumination Sensory Systems Ophthalmology Sensory Thresholds CIELUV Female color constancy business Color Perception 030217 neurology & neurosurgery |
| Zdroj: | Journal of Vision |
| ISSN: | 1534-7362 |
| DOI: | 10.1167/jov.20.13.18 |
| Popis: | Temporal changes in illumination are ubiquitous; natural light, for example, varies in color temperature and irradiance throughout the day. Yet little is known about human sensitivity to temporal changes in illumination spectra. Here, we aimed to determine the minimum detectable velocity of chromaticity change of daylight metamers in an immersive environment. The main stimulus was a continuous, monotonic change in global illumination chromaticity along the daylight locus in warmer (toward lower correlated color temperatures [CCTs]) or cooler directions, away from an adapting base light (CCT: 13,000 K, 6500 K, 4160 K, or 2000 K). All lights were generated by spectrally tunable overhead lamps as smoothest-possible metamers of the desired chromaticities. Mean detection thresholds (for 22 participants) for a fixed duration of 10 seconds ranged from 15 to 2 CIELUV ΔE units, depending significantly on base light CCT and with a significant interaction between CCT and direction of change. Cool changes become less noticeable for progressively warmer base lights and vice versa. For the two extreme base lights, sensitivity to changes toward neutral is significantly lower than for the opposite direction. The results suggest a "neutral bias" in illumination change discriminability, and that typical temporal changes in daylight chromaticity are likely to be below threshold detectability, at least where there are no concomitant overall illuminance changes. These factors may contribute to perceptual stability of natural scenes and color constancy. |
| Databáze: | OpenAIRE |
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