“…Some studies prefed animals for short periods of time (Le., 30-90 min) before each test session Cox, 1976;Pencer, 1974). Some studies allowed animals to consume ad-lib food for 1-2 days prior to and during satiated testing (Gragg & Black, 1967;Haas, Shessel, Willner, & Rescorla, 1970;Linton & Miller, 1951), while others allowed ad-lib food consumption for longer periods of time prior to satiated testing, ranging from 10 days to 2 months (Black & Cox, 1973;Capaldi & Myers, 1978;Wong & Traupmann, 1973a, 1973b, 1975. The type of food used to satiate animals in these studies has also varied .…”