Abstract
Pigeons were trained on concurrent-chain schedules with one response-dependent fixed-interval 30-sec terminal link and one response-independent fixed-delay 30-sec terminal link. The equal, concurrent, initial links were varied across conditions. Measures of the differential effects of the terminal links and of the left/right key bias were calculated at each initial-link duration, using equations derived from the generalized matching law. Two subjects displayed idiosyncratic preferences for one or the other terminal link; however, consistent with previous research, no systematic preference for the fixed-interval or the fixed-delay schedule was found at any initial-link duration.
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