Decrease in fMRI brain activation during working memory performed after sleeping under 10 lux light

Seung Gul Kang, Ho Kyoung Yoon, Chul Hyun Cho, Soonwook Kwon, June Kang, Young Min Park, Eunil Lee, Leen Kim, Heon Jeong Lee

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


The aim of this study was to investigate the effect of exposure to dim light at night (dLAN) when sleeping on functional brain activation during a working-memory tasks. We conducted the brain functional magnetic resonance imaging (fMRI) analysis on 20 healthy male subjects. All participants slept in a polysomnography laboratory without light exposure on the first and second nights and under a dim-light condition of either 5 or 10 lux on the third night. The fMRI scanning was conducted during n-back tasks after second and third nights. Statistical parametric maps revealed less activation in the right inferior frontal gyrus (IFG) after exposure to 10-lux light. The brain activity in the right and left IFG areas decreased more during the 2-back task than during the 1- or 0-back task in the 10-lux group. The exposure to 5-lux light had no significant effect on brain activities. The exposure to dLAN might influence the brain function which is related to the cognition.

Original languageEnglish
Article number36731
JournalScientific reports
Publication statusPublished - 2016 Nov 9

Bibliographical note

Funding Information:
This work was supported by future environmental R&D grant funded by the Korea Environmental Industry and Technology Institute (No. RE201206020).

Publisher Copyright:
© The Author(s) 2016.

ASJC Scopus subject areas

  • General


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