Contrast effects of display colors on Hb concentration changes in the frontal lobe of elderly and young people

Muhammad Nur Adilin Mohd Anuardi, Atsuko K. Yamazaki, Kayoko H. Murakami

Research output: Contribution to journalConference articlepeer-review


The combination display of the background color and font is one of the factors that affect psychological functioning. Many studies investigated the contrast effect on psychological well-being in connection with cognitive activity and task performance. These studies including our previous study, demonstrated the significant effects on brain activity and memory task, especially on elderly subjects. In this paper, we further discussed the contrast effects on the brain activity measured in the frontal lobe of young and elderly subjects. We measured hemoglobin (Hb) concentration changes by using near-infrared spectroscopy (NIRS) when the subjects performing the working memory task (reading span task) on three different display background colors (white, blue, green). Elderly subjects had a lower score on the task compared to younger subjects, which expressed a significant effect of aging, but no significant differences between background colors. On the other hand, the increment trend of the cognitive activity throughout the experiment showed task difficulty induced the blood flow in the brain. Between background colors, the brain activity of the young subject had a negative correlation on the contrast ratio where the low contrast ratio activated their brain activity the most. However, the elderly subject had the opposite results where the higher the contrast ratio, the more activation occurred in their brain. In conclusion, our finding is a key needed to keep activating the brain of elderly people where it tends to experience ability deterioration.

Original languageEnglish
Pages (from-to)4027-4036
Number of pages10
JournalProcedia Computer Science
Publication statusPublished - 2021
Event25th KES International Conference on Knowledge-Based and Intelligent Information and Engineering Systems, KES 2021 - Szczecin, Poland
Duration: 2021 Sept 82021 Sept 10


  • Background color
  • Brain activity
  • Color contrast
  • NIRS
  • Reading span task
  • Working memory

ASJC Scopus subject areas

  • Computer Science(all)


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