Abstract
Studies involving the contribution of stimulus form to the detection threshold for light are equivocal, but theoretical considerations suggest that circular stimuli should yield lower thresholds than bars. This hypothesis was tested by obtaining luminance thresholds for circular and bar-shaped targets presented from 5 to 60 deg into the periphery. Thresholds for circles were significantly lower than thresholds for bars. The difference ranged from about.4 log units at 5 deg to.2 log units at 60 deg eccentricity.
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