CANADA: The color of light could have a significant impact on the way the brain’s clock measures the time of day.
The study is the first to provide a neuronal mechanism for how the internal clock measures the changes in light color present at dawn and dusk, PLOS reported. To make their findings a team of scientists looked at light color present at different times of day to determine if it could be used to tell the time. The findings showed that at twilight, the light is much bluer than it is during the rest of the day.
The researchers also recorded electrical activity from the brain clock while mice were shown a variety of visual stimuli, revealing many of the brain’s neurons responded more strongly to changes in color than brightness. They also simulated an artificial sky that replicated the natural light color changes, and found nocturnal animals that were exposed for more than a month had the highest body temperatures just after dusk, when the sky was the darkest blue. If only the brightness of the sky was changed (with no light color change) the mice became more active after dusk, suggesting their biological clock was not working properly
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