“…In appetitive salivary conditioning, the quantity of food US has been shown to be directly related to the vigor of the CR (Gantt, 1938;Wagner et al, 1964). This finding holds as well for a variety of other preparations, including acid-induced salivary conditioning (Feather, Delse, & Bryson, 1967;Warstler & Ost, 1965), GSR conditioning (Boring & Morrow, 1968), human eyeblink conditioning (Prokasy & Harsanyi, 1968;Spence, 1953;Spence, Haggard, & Ross, 1958;Spence & Platt, 1966), conditioned emotional response procedures (Annau & Kamin, 1961;Ghiselli & Fowler, 1976), finger withdrawal (Elias, 1965), heart-rate conditioning (Dykman & Gantt, 1959;Sideroff, Schneiderman, & Powell, 1971), and conditioning of the nictitating membrane in rabbits (Ashton et al, 1969;Smith, 1968).…”