光源色温对脑波节律及学习效率的影响

通过测试3种不同色温、3种照度下学生脑电图α波、β波指数的变化,观察光照对人体生理节律的影响。实验发现,不同色温、光照强度下的脑波指数变化率差异存在显著性。其兴奋度及敏感性随光源色温、照度值增加,大体呈正相关关系。学习效率随光源色温、照度值增加而降低,呈负相关关系。推测原因似与高色温、高照度状态下更易出现疲劳,低色温、低照度状态下可能对大脑存在＂唤醒＂作用,以及大脑功能分区、光源光谱组成有关。实验结果显示教室光环境的选择,应考虑学生学习的长期性、高负荷等特点,考虑＂时间累积＂效应的综合影响,并值得进一步研究。

Impact on Brain Wave Rhythm and Learning Efficiency by Color Temperature of Artificial Light Sources

This experiment tests the change rate of students＇ α β brain waves under different illuminance levels combining with three color temperatures（CCTs） to indicate the influence of light spectrum on human physiological rhythm.The result shows that the brain electrical activities have significant differences under various CCTs and illuminance levels.The excitement and sensitivity of brain are roughly proportional to the light CCTs and illuminance.Brain electrical activities are more sensible to high CCT illuminations.Keeping mental work in the same time period with the same study intensities,brain fatigue comes earlier and stronger in excitable state at high illuminace and high CCT illumination than in peacful state at low illuminance and low CCT illumination.This situation leads to the learning efficiency of students decreased sharply.An interesting phenomena is that when working in low illuminance and low CCT environment,learning efficiency of students rises with time passing by.That indicates this kind of lighting environment may lead to ＇awake＇ effect of brain.In some environments which have the same illuminance levels with different CCTs that bring about the similar brain activities,learning efficient change rates are different because of the diversity of light spectrum which may induce the different stimulus intensity.Further research work is needed to explain this phenomenon.This experiment points out that the long-term mental workload character during the process of study and comprehensive effect of ＇time accumulation＇must be seriously considered in classroom lighting design.