Detection Time to a Point Source of Light Appearing on a Star Field Background with and without a Glare Source Present1

One hundred and twenty seven untrained observers were tested in a planetarium in order to determine how long it takes to detect the onset of a point source of light appearing at different locations within a star field with and without a veiling glare source present. Results indicated that detection time was shortest when test spots were flashed in a totally dark visual environment. Introduction of a simulated star field produced significantly longer detection times as did the introduction of a star field and glare source. These results are related to findings from previous investigations as well as to certain sighting situations performed in the aerospace environment.

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