A preliminary analysis of light blue backgrounds on the scores of Web-based tests using NIRS

Yamazaki, Atsuko; Eto, Kojiro; Shimada, Hitomi

doi:10.1109/ithet.2013.6671022

Cited by 2 publications

(3 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During a cognitive test on a computer screen, the [tHb] in the PFC depended on the background color (white or blue) of the screen 84 . This study lacks power, because data of only one subject were presented, and without any statistics.…”

Section: Discussionmentioning

confidence: 99%

Effect of short-term colored-light exposure on cerebral hemodynamics and oxygenation, and systemic physiological activity

et al. 2017

View full text Add to dashboard Cite

There is not yet a comprehensive view of how the color of light affects the cerebral and systemic physiology in humans. The aim was to address this deficit through basic research. Since cerebral and systemic physiological parameters are likely to interact, it was necessary to establish an approach, which we have termed "systemic-physiology-augmented functional near-infrared spectroscopy (SPA-fNIRS) neuroimaging." This multimodal approach measures the systemic and cerebral physiological response to exposure to light of different colors. In 14 healthy subjects (9 men, 5 women, age: [Formula: see text] years, range: 24 to 57 years) exposed to red, green, and blue light (10-min intermittent wide-field visual color stimulation; [Formula: see text] blocks of visual stimulation), brain hemodynamics and oxygenation were measured by fNIRS on the prefrontal cortex (PFC) and visual cortex (VC) simultaneously, in addition with systemic parameters. This study demonstrated that (i) all colors elicited responses in the VC, whereas only blue evoked a response in the PFC; (ii) there was a color-dependent effect on cardiorespiratory activity; (iii) there was significant change in neurosystemic functional connectivity; (iv) cerebral hemodynamic responses in the PFC and changes in the cardiovascular system were gender and age dependent; and (v) electrodermal activity and psychological state showed no stimulus-evoked changes, and there was no dependence on color of light, age, and gender. We showed that short-term light exposure caused color-dependent responses in cerebral hemodynamics/oxygenation as well as cardiorespiratory dynamics. Additionally, we showed that neurosystemic functional connectivity changes even during apparently stress-free tasks-an important consideration when using any of the hemodynamic neuroimaging methods (e.g. functional magnetic resonance imaging, positron emission tomography, and fNIRS). Our findings are important for future basic research and clinical applications as well as being relevant for everyday life.

show abstract

Section: Discussionmentioning

confidence: 99%

Effect of short-term colored-light exposure on cerebral hemodynamics and oxygenation, and systemic physiological activity

et al. 2017

View full text Add to dashboard Cite

show abstract

“…Third, electromagnetic fields do not need to be managed, and the surrounding environment does not need to be limited. NIRS, which measures changes in oxygenated hemoglobin (∆oxyHb) concentration, has been used in many studies regarding light and color [18,19,23,24].…”

Section: Measurements Of Physiological Responses 21 Brain Activitymentioning

confidence: 99%

“…In contrast, physiological responses indirectly but objectively measure the psychological state. Previous studies on the emotions generated by light have measured physiological responses (e.g., brain activity [18,19], heart rate [5,20], and electrodermal activity [5,21]).…”

Section: Introductionmentioning

confidence: 99%

Physiological Study of Visual and Non-Visual Effects of Light Exposure

2023

View full text Add to dashboard Cite

Light simultaneously induces visual and non-visual effects. Although the differences in the spectral sensitivity of intrinsic photosensitive retinal ganglion cells induce opposing influences on physiological responses, it is difficult to independently measure only non-visual effects. Therefore, the reported effects of light color on physiological responses are inconsistent. This study aimed to clarify the visual and non-visual effects of light color on physiological responses. Three different conditions were employed to construct a lighting environment in which light colors were difficult to perceive due to chromatic adaptation and change blindness: constant white light (baseline condition), a gradual transition from white to blue light, and a gradual transition from white to red light. The physiological responses (brain activity, heart rate variability, and electrodermal activity) of 21 participants were measured with and without light color perception. The results suggested that blue light causes more non-visual effects compared to red light as blue light induces brain activation in some regions of the PFC (p < 0.05) and increases sweating, although the differences were not statistically significant. A mean comparison suggested that the visual effects of blue light showed tendencies toward a calming role for the prefrontal cortex and inhibition of sweating, but the differences were not statistically significant. Another mean comparison suggested that the visual effects of red light tended to enhance sweating, but the differences were not statistically significant. Visual and non-visual effects did not cause significant differences in heart rate variability. Additionally, a mean comparison did not reveal any significant tendencies.

show abstract

A preliminary analysis of light blue backgrounds on the scores of Web-based tests using NIRS

Cited by 2 publications

References 6 publications

Effect of short-term colored-light exposure on cerebral hemodynamics and oxygenation, and systemic physiological activity

Effect of short-term colored-light exposure on cerebral hemodynamics and oxygenation, and systemic physiological activity

Physiological Study of Visual and Non-Visual Effects of Light Exposure

Contact Info

Product

Resources

About