Subjective ratings
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Subjective ratings of alertness correlate with objective measures of alertness derived from electroencephalographyPerceived workload influences task performance and results from a complex interaction between task-related demands, personal factors (e.g., skills and motivation), and contextual factorsMood states can be acutely altered by bright light exposure or variable lighting conditions (see, e.g.,Asthenopic symptoms are typically caused by sustained concentrated visual effort, acute bright light exposure, or exposure to flickering lightA sleep questionnaire