In the current research, we aimed at extending Silveira et al. (2016) results by verifying whether the long-term maintenance of the equivalence classes is influenced by stimulus valence and MTS training procedures. The delayed and simultaneous MTS were used to train two groups of participants in series of conditional relation trials involving pictures of humans’ faces expressing familiar emotions (A) and abstract forms (B, C, and D). The participants that demonstrated the emergence of novel BD and DB relations and class-consistent derived transfer of functions returned to the laboratory thirty days later. Follow-up assessments were given in which the probability of class-consistent responses was higher for the happy class only for participants exposed to DMTS training. This result shows that the maintenance of equivalence classes cannot be accounted for only in terms of the affective valence of the familiar stimulus. The affective valence of the happy faces may have yoked with the properties of DMTS, favoring the maintenance of the happy class. Thereby, we discussed the role of mediating verbal behavior evoked selectively by the pictures of happy faces appearing as samples that may have persisted during the delay interval as a possible mechanism underlying performances of participants trained in DMTS procedure.

在当前的研究中，我们旨在扩展Silveira等人。（2016）通过验证等效类的长期维护是否受到刺激价和MTS培训程序的影响来得出结果。延迟和同步MTS用于在一系列条件关系试验中训练两组参与者，这些条件关系试验涉及表达熟悉的情绪（A）和抽象形式（B，C和D）的人脸照片。证明新的BD和DB关系出现以及与类一致的派生功能转移出现的参与者在30天后返回实验室。进行了随访评估，其中快乐班级的班级一致反应的可能性仅针对接受DMTS培训的参与者。该结果表明，等价类的维持不能仅根据熟悉的刺激的情感价来解释。笑脸的情感价可能与DMTS的属性有关，有利于保持笑脸。快乐的课。因此，我们讨论了在笑脸图片中选择性地唤起言语行为的作用，这些图片是在延迟间隔期间可能持续存在的样本，作为在DMTS程序中训练的参与者的表现的潜在机制。