“…A stimulus function acquired by a class member transfers to the other class members in the absence of direct training (e.g., Boelens & Smeets, 1990;de rose, Mcilvane, Dube, Galpin, & Stoddard, 1988a;Dougher, Augustson, Markham, Greenway, & Wulfert, 1994;Hayes, Kohlenberg, & Hayes, 1991). Studies showed that transfer decreases with the number of nodes between the stimulus tested and the stimulus that directly acquired a particular function (Fields et al, 1993;Fields, landonJimenez, Buffington, and Adams, 1995).…”