Studies on curiosity drive in rats IV:The effect of hunger drive and sex differences
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Two experiments were designed to examine the effect of hunger drive on exploratory responses in rats, especially in relation to sex differences.<BR>In experiment I, 48 naive rats were divided into an experimental and a control group each having 24 animals : 12 males and 12 females. All were placed in a exploration box, and their exploratory responses to the stimulus cards on the wall of the box were recorded during a 5-min. period under satiated condition (Session, I). The same procedure was repeated for the control group from Session II to IV, one session per day, while the experimental group was subjected to those procedures under 22 hr. of food deprivation. Different patterns of stimulus cards were used for different sessions.<BR>In experiment II, 24 naive rats, half males and half females, were used for an experimental group. They were run under satiated condition in Session I, and 22, 46 and 70 hr. of food deprivation was given in Session II, III and IV, respectively. The data of the control group of experiment I were also used as the control data for experiment II.<BR>Results : <BR>(1) The mean time spent explorating at the stimulus cards decreased as a function of time during a 5-min. period.<BR>(2) Incomplete spontaneous recoveries of exploratory responses were found after 24 hr. of intervals.<BR>(3) In experiment I, food deprivation tended to increase exploratory responses in males, but to decrease in females as compared with control groups (Fig. 2) This tendencies, however, were not statistically significant.<BR>(4) In experiment II, with increasing food deprivation up to 70 hr, the amount of exploratory responses shown by experimental females significantly decreased than those of control females. But there were no differences between both male groups (Fig. 3).
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