摘要(英) |
By simulating indoor office lighting environments, this research explores the physiological, psychological, and concentration effects on users under different lighting conditions. Using a genetic algorithm, the study fits various circadian stimulus (CS) values and correlated color temperatures (CCTs) for lighting scenarios. The experiment inherits the procedures designed in the team previously. Participants are recruited for psychophysical experiments in simulated office environments to investigate the impact of lighting on users’ concentration and psychophysiology.
The experiment involves designing six lighting scenarios with different spectra and conducting two lighting experiments. Experiment one involves a fixed color temperature of 4000 K with varying CS values (0.27, 0.32, 0.37), while experiment two maintains a constant CS value of 0.36 and alters color temperatures (3000 K, 4000 K, 5000 K). Measurement-wise, NeuroSky EEG headsets are used to record brainwave signals during reading and closed-eye rest activities under different lighting scenarios. The collected data are then analyzed by employing empirical mode decomposition (EMD), Hilbert transform (HT), probability density function (PDF), and receiver operating characteristic curve (ROC curve) methods in the time-frequency domain. In the time domain, the Blink algorithm is utilized to remove eye-blink artifacts from the EEG signals and then fractal dimensions are computed by the Higuchi method. Objective indicators include total questions answered, accuracy, and area under the curve (AUC) of the ROC curve, while subjective indicators rely on scores from questionnaires. Finally, the experimental results are imported into the SPSS statistical software for analysis of variance (ANOVA) to understand if there are significant differences in the indicators between lighting scenarios and to explore the impact of lighting on users.
In terms of subjective indicators, questionnaire results show a significant difference in brightness perception between lighting scenario four (CCT 3000 K, CS 0.36) and six (CCT 5000 K, CS 0.36). Participants perceive higher color temperature lighting as brighter in different CCT scenarios. Regarding objective indicators, there are no significant differences between brainwaves of working and resting states under different lighting scenarios. Concentration levels during reading tasks do not differ significantly between scenarios. However, in scenario six with higher correlated color temperature, participants answer more questions, indicating that within this experimental design, lighting with higher correlated color temperature may enhance users’ concentration for reading tasks.
Keywords: Lighting, concentration, circadian stimulus, EEG, Hilbert transform, receiver operating characteristic curve, fractal dimension |
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