“…Key words: intertrial interval, inter-transitional interval, differential conditioning, unconditioned stimulus (US) duration. Kamin, 1961;Gantt, 1938;Hoehler & Leonard, 1981;Ohki & Imada, 1984). Bitgood, & MoOre, 1969;Overmier, 1966aOvermier, , 1966bOvermier, , 1968Riess & Farrar, 1973a, 1973b; , 1967;Meiselman & Moore, 1965;Runquist & Spence, 1959;Tait et al, 1983,第1実 験).…”