Abstract
Pigeons were reinforced for pecking on two concurrent chain schedules. The terminal links consisted of a variable-interval or an arithmetically equivalent fixed-interval schedule. For half the subjects a brief response-independent change in key color signaled reinforcement. This procedure eliminated the differences in predictability of reinforcement between the two terminal link schedules. Tested over several variable-interval and fixed-interval schedule values, the pigeons’ preference for the variable-interval link varied directly with the absolute value of the arithmetic mean but independently of the signal presentation.
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