Understanding behavior under nonverbal transitive-inference procedures: Stimulus-control-topography analyses

Following training with verbal stimulus relations involving A is greater than B and B is greater than C, verbally-competent individuals reliably select A > C when asked “which is greater, A or C?” (i.e., verbal transitive inference). This result is easy to interpret. Nonhuman animals and humans with and without intellectual disabilities have been exposed to nonverbal transitive-inference procedures involving trained arbitrary stimulus relations. Following the training of A + B-, B + C-, C + D-, and D + E-, B reliably is selected over D (i.e., nonverbal transitive inference). Such findings are more challenging to interpret. The present research explored accounts of nonverbal transitive inference based in transitive inference per se, reinforcement, such as value-transfer theory, and operant stimulus control. In Experiment 1, college students selected B > G following the training of A + B-, B + C-, C + D-///E + F-, F + G-, and G + H- (where///signifies the omission of D + E-). In Experiment 2, college students selected B > G following the training of A + B-, B + C-, C + D-///E + F-, F + G-, and G + X- (where X refers to 10 stimuli that alternated across trials). In Experiment 3, college students selected G > B following the training of Y + B-, B + C-, C + D-///E + F-, F + G-, and G + X- (where Y and X refer to 10 stimuli, respectively, that alternated across trials). These findings are discussed in the context of operant stimulus control by offering an approach based in stimulus B typically acquiring only a select stimulus control topography.