Non-Uniformities in Transient Adaptation I: Unrestricted Background Fields

While the four experiments reported here followed this general procedure, there was one important difference. In the earlier studies, the background field was a uniform surface, which simply increased or decreased in luminance as the change from B1 to B2 was made. In the current research, the change in luminance was effected by presenting or removing one or more bright non-uniformities on an other wise uniform, dimmer background.