Abstract
The prefrontal cortex (PFC) is essential in emotional and cognitive processes, yet the effects of light and color on brain activity and emotional perception remain underexplored. This study examined the influence of screen brightness and saturation on emotional perception in human-machine interfaces under simulated daytime, cloudy, and nighttime conditions, with 29 volunteers participating. Functional near-infrared spectroscopy assessed PFC hemodynamics. Results indicated higher pleasantness for low versus high saturation under both high and low brightness, while high brightness and saturation were more attractive to participants. High-saturation screens activated the orbitofrontal cortex (OFC) and left dorsolateral PFC (dIPFC) under high brightness, whereas low saturation increased left dIPFC activation under low brightness. OFC activation positively correlated with pleasantness, while left dIPFC activation negatively correlated with attractiveness. These findings highlight the neurophysiological impact of light and color on emotional perception, providing insights to optimize interface design and user experience in varying lighting conditions.
Published Version
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