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- W2034991554 abstract "Rats exposed to inescapable tailshock fail to learn a shuttle-escape task 24 hours later, an effect referred to as learned helplessness. However, within most rat strains only 10-50% of the animals tested develop this syndrome. In the present study a significant correlation was found between rats that displayed learned helplessness on the first test and those that displayed learned helplessness on a second test performed either 2 weeks (r = .80, p less than 0.001) or 4 weeks (r = .74, p less than 0.001) later. An analysis of the mean session latency of the shuttlebox task in these two tests suggested a bimodal distribution of animals that failed and learned. A significant correlation was found between individual rats that learned this task on the first test and those which learned this task 2 or 4 weeks later. Similarly, in the behavioral despair test, a significant correlation was observed for floating time for individual rats on the first test and on the second test either 2 (r = .72, p less than 0.001) or 4 weeks (r = .63, p less than 0.001) later. However, for the forced-swim test, a unimodal and rather graded response was observed across individual subjects. Thus, performance on the first round predicted performance on the second round in both models. When rats experienced the learned helplessness paradigm on round 1 and the behavioral despair paradigm in round 2, there was no correlation between rats that displayed helplessness following inescapable tailshock and the rats that demonstrated behavioral despair on a later test.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2034991554 date "1989-07-01" @default.
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- W2034991554 title "A pretest procedure reliably predicts performance in two animal models of inescapable stress" @default.
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- W2034991554 doi "https://doi.org/10.1016/0091-3057(89)90403-6" @default.
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