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The photobiology of the human circadian clock.


ABSTRACT: SignificanceThe function of our biological clock is dependent on environmental light. Rodent studies have shown that there are multiple colors that affect the clock, but indirect measures in humans suggest blue light is key. We performed functional MRI studies in human subjects with unprecedented spatial resolution to investigate color sensitivity of our clock. Here, we show that narrowband blue, green, and orange light were all effective in changing neuronal activity of the clock. While the clock of nocturnal rodents is excited by light, the human clock responds with a decrease in neuronal activity as indicated by a negative BOLD response. The sensitivity of the clock to multiple colors should be integrated in light therapy aimed to strengthen our 24-h rhythms.

SUBMITTER: Schoonderwoerd RA 

PROVIDER: S-EPMC9060497 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature

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The photobiology of the human circadian clock.

Schoonderwoerd Robin A RA   de Rover Mischa M   Janse Jan A M JAM   Hirschler Lydiane L   Willemse Channa R CR   Scholten Leonie L   Klop Ilse I   van Berloo Sander S   van Osch Matthias J P MJP   Swaab Dick F DF   Meijer Johanna H JH  

Proceedings of the National Academy of Sciences of the United States of America 20220321 13


SignificanceThe function of our biological clock is dependent on environmental light. Rodent studies have shown that there are multiple colors that affect the clock, but indirect measures in humans suggest blue light is key. We performed functional MRI studies in human subjects with unprecedented spatial resolution to investigate color sensitivity of our clock. Here, we show that narrowband blue, green, and orange light were all effective in changing neuronal activity of the clock. While the clo  ...[more]

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