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The Influence of Dynamic Lighting Conditions on Visibility: A Pilot Study

A pilot laboratory study to measure the effects of dynamic changes in light level on target detection performance was conducted. Subjects responded to peripheral targets following the presentation of a light level increase in one part of a visual display or following no change in light level. Even when the target was located in a different part of the display than the location where the light level increase occurred, reaction times were shorter. There were few missed targets under all conditions tested in the study. While the results cannot be directly applied to vehicular lighting situations, they provide some indication that light level changes can affect target detection in ways unrelated to the change in visibility that the light level change induces.