Abstract
Brightness difference thresholds were obtained from pigeons using a discrete-trial conditioning method. Three Ss were pretrained in the absence of the discriminative stimulus to see whether delayed exposure to difficult discriminations results in good stimulus control. The thresholds obtained were higher and more variable than those of three Ss pretrained with the discriminative stimulus present. The poor stimulus control of the delayed-discrimination Ss was attributed to competition from position habits which carried over from prediscrimination into discrimination training.
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