Abstract
Three pigeons were trained to respond under a two-key discrete trial multiple DRL4:DRL8 procedure in which the exteroceptive cues specifying the scheduled components were presented either throughout each trial or only at the start of each trial. Under continuous cue conditions, the IRT distributions for DRL 4 and DRL 8 components showed little overlap; modal IRT values for each component were slightly higher than the minimum reinforced value. Under brief cue conditions, all IRT distributions were similar, with modal values between 4 and 8 sec for both components. No clear relationship was found between noncontingent collateral responding and DRL value.
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