“…Studies on stimulus equivalence with elderly subjects without NCD show that they are able to learn conditional relations, form equivalence classes, and maintain these relations over time, regardless of the modality of the stimuli and training structure that is used (e.g., Aggio & Domeniconi, 2012; Gallagher & Kennan, 2009; Haydu & Morais, 2009; Rossit, Ramos, & Lopes, 2010; Saunders, Chaney, & Marquis, 2005). Although these elderly people exhibit the formation of equivalence classes, their performance may be lower compared with adolescents and adults (Pérez-González & Moreno-Sierra, 1999; Wilson & Milan, 1995).…”