scholarly journals Effect of intensity of short-wavelength light on electroencephalogram and subjective alertness

2019 ◽  
Vol 52 (3) ◽  
pp. 413-422
Author(s):  
J Lin ◽  
S Westland ◽  
V Cheung
Keyword(s):  
Short Wavelength ◽  
Threshold Intensity ◽  
Night Time ◽  
Minute Exposure ◽  
Subjective Sleepiness ◽  
Eeg Power ◽  
Short Wavelength Light ◽  
Subjective Alertness ◽  
Electroencephalogram Eeg ◽  
Wavelength Light

Short-wavelength light is known to have an effect on human alertness in the night-time. However, there are very few studies that focus on the effect of intensity of light on alertness. This study evaluates the acute alerting ability of short-wavelength light of three different intensities (40 lux, 80 lux and 160 lux). Eight subjects participated in a 60-minute exposure protocol for four evenings, during which electroencephalogram (EEG) as well as subjective sleepiness data were collected. EEG power in the beta range was significantly higher after subjects were exposed to 160 lux light than after they were exposed to 40 lux, 80 lux light or remained in darkness. Also, the alpha theta power was significantly lower under 160 lux light then in darkness. These results show that the effect of intensity on alertness is not linear and further work should be done to investigate the threshold intensity that is required to produce an alerting effect.

scholarly journals Effect of long-wavelength light on electroencephalogram and subjective alertness

2020 ◽  
Vol 52 (6) ◽  
pp. 763-774
Author(s):  
J Lin ◽  
S Westland
Keyword(s):  
Short Wavelength ◽  
Circadian System ◽  
Long Wavelength ◽  
Self Rating ◽  
Beta Power ◽  
Short Wavelength Light ◽  
Subjective Alertness ◽  
Wavelength Light ◽  
Different Levels

This study extends previous findings on the effect of different levels of short-wavelength light on human alertness. This study explores the alerting ability of long-wavelength light at two levels (40 lx and 160 lx). Eight subjects took part in the 60-minute experiment for each of two nights, during which their objective alertness and subjective alertness were evaluated using electroencephalogram and questionnaire. Results show that both levels increased electroencephalogram beta power, which shows a different pattern compared with the previous findings on short-wavelength light. These results strongly suggest that although short-wavelength light may impact alertness through circadian system, long-wavelength light will have to achieve that through other pathways. The further comparison between current and previous results also suggests that long-wavelength light is just as strong on acute alerting ability, as shown by electroencephalogram measures and self-rating questionnaire, as short-wavelength light.

scholarly journals Restricting short-wavelength light in the evening to improve sleep in recreational athletes – A pilot study

2018 ◽  
Vol 19 (6) ◽  
pp. 728-735 ◽  
Author(s):  
Melanie Knufinke ◽  
Lennart Fittkau-Koch ◽  
Els I. S. Møst ◽  
Michiel A. J. Kompier ◽  
Arne Nieuwenhuys
Keyword(s):  
Pilot Study ◽  
Short Wavelength ◽  
Recreational Athletes ◽  
Short Wavelength Light ◽  
Wavelength Light

scholarly journals Visual and non‐visual properties of filters manipulating short‐wavelength light

2019 ◽  
Vol 39 (6) ◽  
pp. 459-468 ◽  
Author(s):  
Manuel Spitschan ◽  
Rafael Lazar ◽  
Christian Cajochen
Keyword(s):  
Short Wavelength ◽  
Short Wavelength Light ◽  
Visual Properties ◽  
Wavelength Light

Effects of a chronic reduction of short-wavelength light input on melatonin and sleep patterns in humans: Evidence for adaptation

2014 ◽  
Vol 31 (5) ◽  
pp. 690-697 ◽  
Author(s):  
Marina C. Giménez ◽  
Domien G. M. Beersma ◽  
Pauline Bollen ◽  
Matthijs L. van der Linden ◽  
Marijke C. M. Gordijn
Keyword(s):  
Short Wavelength ◽  
Sleep Patterns ◽  
Short Wavelength Light ◽  
Wavelength Light ◽  
Light Input

scholarly journals Multiple Phototransduction Inputs Integrate to Mediate UV Light–evoked Avoidance/Attraction Behavior in Drosophila

2019 ◽  
Vol 34 (4) ◽  
pp. 391-400 ◽  
Author(s):  
Lisa Soyeon Baik ◽  
Yocelyn Recinos ◽  
Joshua A. Chevez ◽  
David D. Au ◽  
Todd C. Holmes
Keyword(s):  
Short Wavelength ◽  
Uv Light ◽  
Behavioral Responses ◽  
Time Of Day ◽  
Spatiotemporal Resolution ◽  
Circadian Time ◽  
Light Duration ◽  
Short Wavelength Light ◽  
Attraction Behavior ◽  
Wavelength Light

Short-wavelength light guides many behaviors that are crucial for an insect’s survival. In Drosophila melanogaster, short-wavelength light induces both attraction and avoidance behaviors. How light cues evoke two opposite valences of behavioral responses remains unclear. Here, we comprehensively examine the effects of (1) light intensity, (2) timing of light (duration of exposure, circadian time of day), and (3) phototransduction mechanisms processing light information that determine avoidance versus attraction behavior assayed at high spatiotemporal resolution in Drosophila. External opsin-based photoreceptors signal for attraction behavior in response to low-intensity ultraviolet (UV) light. In contrast, the cell-autonomous neuronal photoreceptors, CRYPTOCHROME (CRY) and RHODOPSIN 7 (RH7), signal avoidance responses to high-intensity UV light. In addition to binary attraction versus avoidance behavioral responses to UV light, flies show distinct clock-dependent spatial preference within a light environment coded by different light input channels.

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