Abstract
The five pigeons in Group 1 were given successive intradimensional discrimination training in which responses to a line of 49° were reinforced on a variable-interval schedule and responses to a line of 33° were not reinforced. Subsequent generalization testing with other line orientations revealed a peak shift from the positive stimulus in the direction away from the negative stimulus in all subjects. The four pigeons in Group 2 received successive discrimination training with the 49° value on the key during both stimuli. During the negative stimulus, however, the floor was tilted 16° counterclockwise. When tested (with the floor flat) these subjects showed peak shifts similar to those observed with Group 1. A third group of three pigeons, given successive interdimensional discrimination training with the 49° line as the positive stimulus and the absence of the line as the negative, showed no peak shift in a subsequent generalization test. It was concluded that tilting the floor on which the pigeon stood systematically distorted the bird's visual perception of the orientation of the line in a manner consistent with the results of other studies in this laboratory.
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Selected References
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