[Purpose] This study investigated color temperature’s impact on task performance. It
presents a scientific analysis of brainwave and task performance time changes, and the
results of a self-report type survey. [Subjects] Twenty-four elementary school fifth-grade
boys and girls with no visual problems participated in the experiment. [Methods]
Physiological reaction times of task performance were measured in a laboratory that could
fix and maintain color temperature. Brainwave changes and the task performance times were
measured, and a self-report questionnaire was conducted in order to measure of emotional
reactions. [Results] Regarding the brainwave changes associated with color temperature,
alpha waves were emitted in the O2 area when puzzle tasks were illuminated by orange light
and low and high beta waves were emitted in the F3 area under white light. Five items
(Brilliant, Soft, Lively, Relaxed, Open) were reported predominantly in responses to
orange light in the self-report questionnaire. [Conclusion] The results of this study show
that relaxation and stability are not assured when the color temperature is low, and that
concentration and cognitive activity are not necessarily easier when the color temperature
is high. The color temperature change when performing tasks promoted emotional factors
more than brainwave, a biological change.