Abstract
To determine how posture affects the perception of the elderly to judge the brightness of light, an experiment was conducted in which 23 participants older than 65 judged brightness when they were in one of two postures, sitting or reclining. The position and luminance of a light source and the participant’s gaze direction were controlled. The participant was instructed to adjust the brightness of a second light source so that the brightness of both sources was the same. The ratio of the two brightnesses was used as the metric. The accuracy of brightness judgment depended on both the posture (sitting or reclining) and the gaze direction. It also depended on the luminance level regardless of the light source position, gaze direction, and posture. These findings can be used, for example, in the design or elderly-friendly living environments.
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