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Chronobiology studies physiological variations due to the time of day, an unexplored factor in design research. This paper explores the effect of time of day on designers' physiological responses in idea generation. Convergent (CT) and divergent (DT) thinking, as building blocks of designing, are explored using pupil dilation as a proxy for cognitive load. Time of day and educational background are explored for engineering and 10-Industrial Designers. Results show a larger pupil diameter in the afternoon than in the morning, especially for DT, with higher values for 10-Industrial Designers.

Keywords:

design cognition, idea generation, chronobiology, pupil dilation, educational background