Light & Engineering 31 (6)

Volume 31
Date of publication 12/13/2023
Pages 118–120

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Diurnal Modulation of Pupillary Light Reflex L&E, Vol.31, No.6, 2023

Articles authors:

Ryuma Senba, Yu Maruyama, Motoharu Takao

Ryuma Senba is a master’s student majoring in information science at Tokai University, Japan. He is conducting a study on circadian photo-entrainment in humans under the supervision of Prof. Motoharu Takao

Yu Maruyama is a master’s student majoring in information science at Tokai University, Japan. He is researching the effects of chromatic light on circadian rhythm in humans. He is a member of Prof. Takao’s laboratory

Motoharu Takao is a Professor at Tokai University in Japan. He obtained his Ph. D. from Osaka University, Japan. He received academic training at Brown University, U.S.A. and at the National Institute for Basic Biology, Japan. His primary interest lies in the neural mechanisms of circadian photo-entrainment, but he also explores a wide range of academic fields related to human cognitive activities

Abstract:

Pupillary light reflex is mediated by intrinsic photosensitive retinal ganglion cells (ipRGCs) and the midbrain in human brain. The cells ipRGCs are highly sensitive to blue light (~ 480 nm). In this study, we evaluated diurnal changes in chromatic sensitivity of ipRGCs by measuring pupillary light reflex. The data showed that sensitivity to red and green light increased from morning to evening, but that to blue decreased from noon to evening. These results indicate that sensitivity of ipRGCs may decreases in evening.

References:

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Keywords

DOI: https://doi.org/10.33383/2023-054

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