“…Since Lindsley's initial application, researchers have used conjugate preparations extensively to examine operant behavior of infants (Rovee-Collier & Capatides, 1979;Rovee-Collier & Gekoski, 1979;Weisberg & Rovee-Collier, 1998). More broadly, other studies have used conjugate schedules to examine (a) individuals' sensitivity to social stimuli presented during product advertising (Lindsley, 1962;Nathan & Wallace, 1965;Winters & Wallace, 1970;Wolf, Newman, & Winters, 1969); (b) the attending behavior of individuals in supervision or psychotherapeutic contexts (Lindsley, 1963;Nathan, 1965;Nathan, Bull, & Rossi, 1968;Nathan, Marland, & Lindsley, 1965;Nathan, Schneller, & Lindsley, 1964;Nathan, Smith, & Rossi, 1968); and (c) individuals' preferences for auditory stimulation (Lovitt, 1966;1967, 1968a, 1968bMira, 1968;1970;Morgan & Lindsley, 1966), among others (e.g., Lindsley & Conran, 1962;Lindsley, Hobika, & Etsten, 1961). While these researchers used conjugate schedules in their preparations to examine other phenomena as independent variables, the studies did not examine conjugate reinforcement per se.…”