Abstract
The effect of varying the color of the background behind two solid object discriminanda on transfer to line drawings was tested with pigeons. In Experiment 1, objects were placed in front of either a white or gray background for initial discrimination training, then, in transfer tests in extinction, the display background colors were either the same or switched, or the display was a line drawing of the objects. The switch from gray to white disrupted performance about as much as the switch to the line drawing. The switch from white to gray did not disrupt performance as much, but, again, no transfer to the line drawing was seen. In Experiment 2, the background color behind the objects was changed every day, the intention being to make background color irrelevant. No transfer to line drawings following this training was seen.
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