This study explored the impact of daylight illuminance on cognitive load during visual display terminal use by means of various physiological, performance and subjective measures. Repeated-measures design was adopted to identify the impact of variations in daylight levels that were manipulated through the shading system configurations (shading-on; shading-off). A total of 30 subjects performed visual and cognitive demanding tests. Performance measures were supported by subjective data and eye-related measures during the experimental analysis. Results revealed that the use of a shading system had positive impact on sustained attention. Concerning ocular measures, percentage of eye closure values showed opposite tendencies among vigilance and sustained attention demanding tests. Eye aspect ratio-max and blink duration were significantly correlated with reported glare sensation. In all tests, eye aspect ratio-max was found significantly higher in lower illuminances. Search velocity was significantly correlated with ocular variables in higher illuminances whereas sustained attention showed an opposite trend. This, initially, explains that even slight differences in daylight illuminance might have distinctive effects on the relationship between different groups of assessment variables while measuring cognitive load. Secondly, it proves the significance of carrying out sensitive experiments in terms of both light levels and test characteristics. Practical application: The findings of this study could suggest that a practical application, the use of a shading device, might deliver an efficient solution on such a multifaceted question about the potential effects of luminous environment on the evaluation of cognitive load. Work environments might be considered as cognitively efficient if only the harmony of less mental effort, more satisfaction and less health problems exist, which together ultimately deliver higher work performance. In real-world work environments, application of such shading devices involves advantages not only for avoiding excessive daylight exposure or optimizing energy consumption, but also facilitating cognitive, affective and physiological processes of individuals.

中文翻译：

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分析日光照度与视觉显示终端工人的认知，情感和生理变化之间的关系

这项研究通过各种生理，表现和主观措施，探索了日光照度对视觉显示终端使用过程中认知负荷的影响。采用重复测量设计来确定通过遮光系统配置（开启遮光；关闭遮光）操纵的日光水平变化的影响。共有30位受试者进行了视觉和认知方面的严格测试。在实验分析过程中，性能指标得到主观数据和眼睛相关指标的支持。结果表明，使用遮光系统对持续关注具有积极影响。关于眼部测量，闭眼值的百分比在警惕性和持续注意要求测试中显示出相反的趋势。眼睛长宽比最大值和眨眼时间与所报告的眩光感显着相关。在所有测试中，发现较低的照度下的眼睛长宽比最大值明显更高。在较高的照度下，搜索速度与眼睛变量显着相关，而持续关注则显示出相反的趋势。最初，这说明在测量认知负荷时，即使是日照度的微小差异也可能对不同评估变量组之间的关系产生显着影响。其次，从光强度和测试特性两个方面证明了进行敏感实验的重要性。实际应用：这项研究的结果可能表明实际应用，使用遮光设备，也许可以针对发光环境对认知负荷评估的潜在影响这一多方面的问题提供有效的解决方案。如果仅存在较少的精神努力，更多的满足感和更少的健康问题之间的和谐，那么工作环境就可以被认为是认知有效的，这最终会带来更高的工作绩效。在现实世界的工作环境中，这种遮光装置的应用不仅具有避免过度日光照射或优化能量消耗的优势，而且还促进了个人的认知，情感和生理过程。存在更多的满意度和更少的健康问题，这些问题最终共同带来更高的工作绩效。在现实世界的工作环境中，这种遮光装置的应用不仅具有避免过度日光照射或优化能量消耗的优势，而且还促进了个人的认知，情感和生理过程。存在更多的满意度和更少的健康问题，这些问题最终共同带来更高的工作绩效。在现实世界的工作环境中，这种遮光装置的应用不仅具有避免过度日光照射或优化能量消耗的优势，而且还促进了个人的认知，情感和生理过程。