Untitled

Abstract

Fig. 1 Schematic diagram of apparatus used to assess the degree of preference for a drug , by rats. The distance between the food cups is 30 cm.The diameter of each pulley is 10cm and 2.5cm.The weight connected to a cord indicates the degree of willingness to pull, by a rat, who wants the morphine-admixed food. Fig. 2 Pulling pattern of weight (40g/100g body weight) in the rat with a developed preference for morphine. The ordinate denotes the pulling distance (cm); and the abscissa, time.Fluctuating wave represents eating behavior of morphine-admixed food. Upper columns show the result of the control group and the lower ones the morphine group. Fig. 6 Pulling pattern of weights (40g/l00g body weight and 60g/l00g body weight) in the rats in the morphine (L) group. The ordinate denotes the pulling distance (cm); and the abscissa, time. Fluctuating wave represents eating behavior of morphine-admixed food. Psychol. 41, 450 (1948) Abstract-Tsutomu SUZUKI,