PREFERENCE FOR FIXED‐INTERVAL TERMINAL LINKS IN A THREE‐KEY CONCURRENT CHAIN SCHEDULE

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Abstract
Pigeons were trained on three‐key concurrent chain schedules in which the initial links were variable‐interval schedules and the terminal links were fixed‐interval schedules. In the first experiment, the initial links were all equal and the terminal‐link schedule on one key only was varied. In the second part of the experiment, the terminal‐link schedules were all fixed, but different, and the initial‐link schedule on one key was varied. Relative response rates in the initial links did not match either the relative arranged, nor the relative obtained, terminal‐link reinforcement rates. The relations between independent and dependent variables in three‐key concurrent chains were similar to, but not identical with, those found in two‐key chains comprising the same schedule types.

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