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The effect of food and water deprivation on post-stress analgesia in mice and levels of beta-endorphin and dynorphin in blood plasma and hypothalmus.
Increased hypothalamic norepinephrine metabolism after water deprivation in the rat.
Missanin and Campbell (1969) specifically tested rats' responsiveness to inescapable shock under both food and water deprivation conditions.
The present experiments were designed to assess the interaction of water deprivation with the effects of inescapable shock exposure, both during exposure to inescapable shock and on a subsequent test for shuttle escape acquisition.
The results of this experiment suggest that water deprivation can interact with an aversive drive established through exposure to inescapable shock, perhaps through an increase in activity.
Although the results of Experiment 1 demonstrate that water deprivation can ameliorate the escape impairment normally seen following exposure to inescapable shock, it does not identify whether deprivation during the training or test phase alone is sufficient to overcome the escape impairment normally seen.
This could suggest that the results of Experiment 1 were caused by an increase in appetitive drive produced by water deprivation during the shuttlebox escape test.
The results of Experiment 2 suggest that water deprivation during test, like an increase in test shock intensity, is sufficient to disrupt the escape impairment typically seen in the FR2 shuttle escape task following exposure to inescapable shock.
Although nondeprived, no-shock animals run in many previous experiments showed no shock-escape impairment, the last group was added to determine whether water deprivation affected performance of such animals.
One interpretation that these data suggest is that water deprivation may increase motivation or drive levels with an attendant increase in activity during inescapable shock exposure, at least partially counteracting the passivity normally observed.
A cause of this may be that the conditioned preference was tested under water deprivation.
Although this possibility had been noticed, we were afraid that testing without water deprivation would result in group differences in the total intake on the test days.