“…Some studies have shown that mere restriction of one response in a pair is sufficient to produce an increase in the other response, independent of any contingent relation (e.g., Allison & Timberlake, 1974;Bernstein, 1974;Dunham, 1972; Timberlake, 1979). Few studies, however, have restricted access to one response and examined the effects on two or more other responses (Dunham, 1977;Knapp, 1976; Konarski, Crowell, Johnson, & Whitman, 1982;Konarski, Johnson, Crowell, & Whitman, 1981; but see, e.g., Lyons & Cheney, 1984;Rojahn, Mulick, McCoy, & Schroeder, 1978). Bernstein and Ebbesen (1978) were among the first to point out that…”