Effects of Color Temperature of Illumination on Physiological Functions

Katsuura, Tetsuo; Jin, Xinqin; Baba, Yuya; Shimomura, Yoshihiro; Iwanaga, Koichi

doi:10.2114/jpa.24.321

Cited by 26 publications

(20 citation statements)

References 7 publications

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“…This result showed that the 180-s production time intervals feel faster-passing in the red light condition than in the other color conditions. Katsuura et al (2005) found the same result that the subjective time sense runs faster in the red light condition than in the blue light condition. However, an interesting finding in the present study was that this effect was attenuated in the 600-s time estimation task, because the time sense in the red light condition came to show a marginally significant difference from the other color conditions.…”

Section: Discussionsupporting

confidence: 52%

“…Light can elicit acute physiological and psychological responses in human beings. The magnitude of responses depends on the color temperatures, intensity, wavelength components and duration of light exposure (Noguchi and Sakaguchi, 1999;Katsuura et al, 2005). Recent studies have found an effect of the light wavelength on suppression and phase delay of the melatonin rhythm (Morita and Tokura, 1998;Brainard et al, 2001;Lockley et al, 2003Lockley et al, , 2006Hanifin et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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Effects of Monochromatic Light on Different Time Perception

Huang

Shimomura

Katsuura

2012

JHES

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Time is a fundamental dimension of life. Previous studies reported that time perception is affected by several physiological and psychological factors (age, gender, time of day, flickering stimulus, etc). Light exerts visual and non-visual effects with respect to biological rhythms. However, it has not been confirmed that perception of the passage of time could be affected by the light environment. In this study, we investigated the physiological and psychological responses when subjects were exposed to different monochromatic light environments (there were four conditions of light intensity that varied by illuminance and irradiance). We evaluated the time sense by time tests of 180 s and 600 s. The results showed that the time sense runs significantly faster in a red light condition than in any other monochromatic light condition (green, blue Ⅰ and blue Ⅱ which is approximate half irradiance compared with blue Ⅰ) in a 180-s time production task. However, in the 600-s estimation time task, the time sense tended to be significantly faster in the red light condition than in the blue Ⅰ or blue Ⅱ light conditions, and in the green light condition the time sense ran significantly faster than in the blue Ⅰ light condition. There was no significant difference in color factor in P300 which is one of evoked potential components measured with electroencephalography (EEG), however, a significant trend was found in amplitudes of P300, which showed that the cognitive level tended to be high in the blue Ⅱ light condition. The EEG alpha wave amplitude significantly increased in the green light condition compared to the amplitude in the blue Ⅰ light condition. The results of SDPTG which is an index of autonomic nervous system measured with photoplethysmography (PPG), in which there was a significant trend to be faster in the blue Ⅰ light condition than in the green or blue Ⅱ light conditions, showed that blue light might have a sympathomimetic effect. There was no significant difference in color factor in the subjective assessments, except the subjects felt more eyestrain in the blue Ⅱ than in the red light condition. These results indicate that the perception of the passage of time ran faster in the red-light than in the other light conditions. We suggest that red light has an active effect in a short time interval through the visual processing pathway and decays with time. The blue light seems to have a sustained effect on the central nervous system, but people may not be responsive to a short time interval exposure to blue light.

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Section: Discussionsupporting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

Effects of Monochromatic Light on Different Time Perception

Huang

Shimomura

Katsuura

2012

JHES

Self Cite

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“…Mental tasks generally consist mainly of vigilance, short-term memory, and tracking. In the case of the complex task established by Jin et al (2003) using a combination of visual search and short-term memory, many physiological indicators including the electroencephalogram, HRV, and blood pressure, which were often used in other studies, such as those conducted by Katsuura et al (2005), Jin et al (2003), and Aasman et al (1987), exhibited significant change in response to level of difficulty. Because driving a car and operating machinery always require visual search and recording and reproduction of short-term memory, they were considered optimal tasks for the present study.…”

Section: Taskmentioning

confidence: 99%

Use of Frequency Domain Analysis of Skin Conductance for Evaluation of Mental Workload

Shimomura

Yoda

Sugiura

et al. 2008

J Physiol Anthropol

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A specially designed mental task was performed by 16 subjects for frequency domain analysis of skin conductance (SC) to evaluate mental workload. The task was to memorize target letters, detect them within a 4ϫ4 alphabet arrangement, and answer whether the number of targets contained in the arrangement corresponded to a randomly displayed number. As the number of target letters increased, the score for the card-sort NASA Task Load Index (CSTLX) and task performance increased significantly. The traditional parameter for the number of transient wave forms of SC response (SCR) and the height of its wave did not show any significant effect of task difficulty. In addition, SCRs were subjected to Fourier transformation and integration of the spectrum from 0.03 to 0.5 Hz. This frequency domain analysis enabled detection of small differences in mental workload that could not be detected by traditional amplitude domain analysis. Frequencybased analysis enables easy processing of physiological signals and is very effective in evaluating mental stress using SC recorded under actual environmental conditions such as the driving of a vehicle.

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“…Electroencephalography (EEG) is an electrophysiological method to record the brain activity and its change according to different lighting conditions. 12 Because prior EEG studies were limited to investigations for young subjective, [13][14][15] little is known about neurophysiological characteristics of the lighting effects in elderly subjects. Therefore, herein, we investigated brain oscillatory characteristics according to brightness and color temperature of light by analyzing power spectral density and functional connectivity derived from resting-state EEG recordings.…”

Section: Introductionmentioning

confidence: 99%

Differential Effect of Light Emitting Diode Light on Electroencephalographic Oscillations in Young and Old Healthy Subjects

Sunwoo

Lee

et al. 2017

J Sleep Med

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To investigate brain oscillatory characteristics according to brightness and color temperature of light emitting diode (LED) light in young and elderly subjects. Methods: We analyzed 22 young (age, 29.0±5.2 years) and 23 elderly (age, 64.8±4.5 years) healthy subjects. A LED light source was used with a combination of two color temperature (6,500 K vs. 3,000 K) and two brightness (700 lx vs. 300 lx) conditions. Participants were exposed to each light condition in relaxed wakefulness. Then, we analyzed power spectral density and functional connectivity from eye-open electroencephalography. Results: A main effect of brightness on delta (p=0.044) and theta (p=0.038) power was significant in the elderly subjects. Bright light enhanced delta and theta power in the frontal region. By contrast, power spectral density of young subjects was affected by color temperature; high color temperature significantly increased beta-band power of the central region (p=0.034). Regarding functional connectivity, a significant effect of color temperature was observed in delta (p=0.006) and beta (p=0.046) frequencies. High color temperature light enhanced beta connectivity of young subjects (p=0.007), while not affecting that of elderly subjects (p=0.979). Conclusions: The present study demonstrated that spectral power and functional connectivity as well as subjective feelings are affected by the brightness and color temperature of LED light. These results might help us to understand the neurophysiological effects of light and identify the optimal indoor lighting conditions for an individual's environment.

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Effects of Color Temperature of Illumination on Physiological Functions

Abstract: This article presents our recent studies on the effects of color temperature on the taste sense and the influence of color temperature on bright light

Cited by 26 publications

References 7 publications

Effects of Monochromatic Light on Different Time Perception

Effects of Monochromatic Light on Different Time Perception

Use of Frequency Domain Analysis of Skin Conductance for Evaluation of Mental Workload

Differential Effect of Light Emitting Diode Light on Electroencephalographic Oscillations in Young and Old Healthy Subjects

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