An experimental study of the effect of starvation on the activity in the white rat
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The purpose of this experiment was to study the increment of the activity with starvation in relation to sex difference under two conditions ; one the measurement of simple general activity in the expectation of food reward, the other the measurement of running a alley with tread-mill.<BR>Exp. 1 : General activity of 15 male and 31 female rats. was measured by rotating cage for 5 minutes per day during four weeks. In the first week all the animals were satiated. After the activity level was observed, they were divided into two groups, one experimental and the other control. During the next week the experimental group, 8 males and 16 females, were not given any food but water. In the last two weeks they were satiated again. For control groups the feeding was unrestricted for four weeks.<BR>General activity of male rats of the experimental group increased in the second half of the period of deprivation. The female showed no significant increment of the activity level (Fig. 1 and Table 1).<BR>Exp. 2 : Six male and 6 female rats were given five rewarded runs a day for 20 days in a straight-alley (Fig. 2). At the fifth trial of the daily runs they were confined at the middle portion of the alley where their activities were recorded by a tread-mill for 5 minutes. For the first 10 days they were given food of 5 per cent of the body weight per day and satiated on 11th day. Next 7 days the animals were deprived of all food except reward in the goal box and last two days satiated again. For both male and female animals the activity increased steadily as starvation continued (Fig. 3).<BR>Since there were some differences between two methods of the experiments, each measure was converted into ranked score (Table 2). As Table 2 shows, the increment of the activity in Exp. 2 was greater than Exp. 1. The difference in the activity between two experiments was much significant for female animals.
- 日本動物心理学会の論文
日本動物心理学会 | 論文
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