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Characteristics of brightness perception with two light sources presented to peripheral vision

The degree of brightness in a full space as perceived by humans, and the consideration of a sense of brightness within a space, can be expected to serve as an index for the design of an agreeably illuminated space. Even though there have been significant amounts of research performed on brightness perception, investigations have not yet extended to the characteristics of brightness perception by multiple light sources directed to peripheral vision. The purpose of this study is to clarify the characteristics of brightness perception when two light sources are presented to the area of peripheral vision. The experiment was conducted using an adjustment method in a darkened room. A display was used to present a matching light and a test light. The matching light was presented at the center of the display, and the test light was presented at various angles from the center of the display. The results were suggested that the brightness sensitivity with increasing eccentricity increases and the brightness sensitivity is high for the vertical downward direction but is low for the 45° and 135° directions.