The feature-positive effect in pigeons: Conditionality, overall predictiveness, and type of feature

摘要: Two experiments examined variations of standard visual discrimination arrangements in which pigeons typically perform much better when a distinguishing feature appears on reinforced (featurepositive) than nonreinforced (feature-negative) trials. In Experiment 1 the was continuously present response key during intertriai intervals as well appropriate type trial. Although retarded its appearance, strong feature-positive superiority did occur. 2 and common cues were reversed function from those conventional procedures; small white square to all trials, distinctive element involved illumination with green color. Nevertheless, significant found, although excellent performance achieved rapidly for both groups. The results suggest that conditionality versus nonconditionality two discriminations feature’s overall positive predictiveness food are not crucial producing superior discriminative case.