Abstract
4 pigeons, after being trained on a discrimination with 3 black vertical lines as S+ and 3 black horizontal lines as S−, were switched to a discrimination with 1 white vertical line as S+ and 1 white horizontal line as S−. They performed the second discrimination with no appreciable loss of accuracy and a small decrease in rate of responding. Another group, for which the second discrimination was 1 white vertical line as S+ and a white key as S−, showed an initial increase in number of errors but very rapid mastery of the second problem. The data indicate that line orientation is independent of hue or intensity as a dimension of stimulus control in pigeons.
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