Abstract
The threshold for a small spot of light rises as it approaches the edge of an illuminated area and gradually falls in the dark. The threshold rise on the illuminated side of the edge was found to be dependent on the intensity of the illuminated field, absent at low in tensity. Short duration flashes of both edge and test spot abolished the threshold elevation on the illuminated side of the edge regardless of field intensity. While the threshold rise may be associated with lateral inhibitory effects, the fall in the dark was shown to be due to stray light in the eye.
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