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Effect of Light on Cognitive Function During a Stroop Task Using Functional Near-Infrared Spectroscopy.

Yafei Yuan1, Guanghao Li1, Haoran Ren1

  • 1Department of Electronic Engineering, Center for Intelligent Medical Electronics, Fudan University, Shanghai, 200433 China.

Phenomics (Cham, Switzerland)
|March 20, 2023
PubMed
Summary

Investigating light

Keywords:
Cognitive functionLight modulatesStroop taskfNIRS

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Area of Science:

  • Cognitive Neuroscience
  • Neuroimaging
  • Human Physiology

Background:

  • Light influences human circadian rhythms, impacting behavior and physiology.
  • Functional near-infrared spectroscopy (fNIRS) noninvasively measures brain activity.
  • The prefrontal cortex plays a key role in cognitive functions.

Purpose of the Study:

  • To explore how different light conditions affect cognitive function.
  • To examine prefrontal cortex activation using fNIRS.
  • To assess light's modulatory impact on cognitive tasks.

Main Methods:

  • Thirty participants completed the Stroop task under three light conditions: 4500 K, 2500 K, and no light.
  • Behavioral data (response time, accuracy) were collected.
  • Brain activity was monitored using functional near-infrared spectroscopy (fNIRS).

Main Results:

  • Light conditions significantly modulated task performance, affecting response time and accuracy.
  • fNIRS detected hemodynamic changes in the bilateral dorsolateral prefrontal cortices.
  • Specific brain activation patterns differed across the tested light conditions.

Conclusions:

  • Light is a safe, effective, and accessible tool for modulating cognitive function.
  • Different light color temperatures influence prefrontal cortex activity.
  • fNIRS is a valuable technique for studying light's effects on the brain.