Abstract
2 pigeons were exposed to a concurrent-chains procedure consisting of identical 60-sec. random-interval initial links and terminal links which resulted in reinforcement on either a 60-sec. random-interval schedule, or a 30-sec., 60-sec., or 120-sec. non-contingent reinforcement schedule. For both Ss, data indicated a preference for the non-contingent reinforcement schedule at both the 30- and 60-sec. values.
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