Acquistion of Same-Different Discrimination
with Multiple Stimulus Classes

How and in what way did the four different display types affect the rate of learning this same-different discrimination?

The summary answer is that the pigeons showed little difficulty in learning this complex discrimination, with there being little or no influence attributable to the structural differences of the four display types. This can be seen in the group and individual data provided below. Apparently the distinct attributes of the four display types did not influence the rate of learning this form of choice discrimination. This suggests the pigeons were not learning four separate discriminations, but were learning a single type of same-different discrimination that was applied to all of the display types at the same time.