![]() Thus, an auditory signal that does not itself support pecking may enable a localized visual stimulus to evoke key pecking. A further experiment failed to discover any significant differences in the levels of second-order pecking to a keylight paired with a first-order tone CS or with a first-order keylight CS. I created the most comprehensive intro to After Effects, ever. In Experiment 3, the amount of pecking directed towards a keylight which predicted the first-order, tone CS was as substantial in birds without a prior history of key pecking as in birds with such a history. In Experiment 2, second-order pecking to the keylight increased in probability across four groups that had received, respectively, 20, 80, 140, or 200 paired presentations of tone and grain. Substantial second-order conditioned pecking to the keylight was produced in the birds that had received paired presentations of tone and grain. ![]() ![]() ![]() In Experiment 1, pigeons were exposed either to paired or to unpaired presentations of a tone and grain, and then to paired presentations of a keylight with the tone. ![]()
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