Daily variation of visual perception of colors: Preliminary studies.

Abstract

This study aimed to measure the axes of colors confusion according to the circadian typology (CT). For this purpose, 28 young male adults aged 20 to 28 participated in this study. The characteristics of the sample were: morning moderately (MM; n = 8; M = 23.25 ± 2.6); Intermediate (I; n = 10; M = 23.30 ± 2.7) and evening moderately (EM; n = 10; M = 23.70 ± 2.5). We used the Pittsburgh Sleep Quality Index (PSQI) and Horne and Ostberg’s questionnaire to ascertain aspects of sleep quality and CT and Cambridge Colour Test (CCT) and the Lanthony Desaturated D-15 Test (D-15d) to verify the color perception. Significant difference was found in the PSQI (F(2.20) = 15.77, p < .001; η2 = 0.62) between EM compared with I (p < .001) and MM (p < .001). We found a difference in the protan confusion axes at 9 a.m. (χ2 = 6.74; p < .05) and 9 p.m. (χ2 = 7.11; p < .05) and deutan at 5 p.m. (χ2 = 11.23, p < .001). The chromatic confusion axes will vary according to the synchronization of daily variation and the EM typology has higher chromatic sensitivity, pointing to a possible relation between visual circadian filters and spatial chromatic information. The daily fluctuation of visual sensitivity may explain the preliminary results on the circadian effects on color perception.

Visual processing of color and shape in people with leprosy

“…& Nogueira, 2003). The color discrimination measures the ability of the visual system to discern colors from thresholds for short (S), medium (M), and long (L) wavelengths (Andrade et al 2018b;Lima, Gomes, Ventura, & Silveira, 2011;MacLeod, 2003). We found SC losses in the low (0.2 cpd) and high (5, 10, and 16 cpd) spatial bands, but we did not find any losses in the low and medium frequency bands (0.5 and 1.0 cpd), according to Fig.…”

Circadian Sensation and Visual Perception

“…The results did not show variation in CSV of morning subjects, but detected fluctuation in CSV for night subjects with greater sensitivity in the period of 21:00 in spatial frequencies of 1.0, 3.1 and 13.2 cpg, and fluctuation in CSV for intermediate subjects in spatial frequencies of 0.2 and 15.6 cpg. Furthermore, the study by Andrade et al [27,31] pointed out that intermediate subjects have maximum sensitivity in spatial frequency 0.2 cpg at 17:00 when compared to 9:00 and 13:00 times. There was an attenuation in visual sensitivity during the morning in all groups, except for morning subjects.…”

“…Remember that rods and cones ingrate ipRGCs and, consequently, circadian behaviors may be associated with these mechanisms. Recent findings have shown that mechanisms that process the contrast of luminance and color are associated with the circadian timing pattern [27,31].…”

“…Recent studies prepared by Andrade, Silva, and Santos [44] and Andrade et al [27,31] evaluated CSV circadian fluctuation in healthy adult subjects according to circadian typology at different times of the day. These studies indicate that CSV curves have minimum sensitivity at 09:00, progressive increase from 13:00 to 17:00 and maximum sensitivity at 21:00.…”

“…Andrade et al [27,31] also evaluated CSV according to circadian typology and measurement time of adult men (M = 23.42 ± 2.6 years) during a daily period. The authors observed that CSV curves had decreased sensitivity for low and high spatial frequencies [46] and peak sensitivity for average spatial frequencies [42].…”