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- W2058156961 abstract "Exposure to acute stressful experience can enhance the later ability to acquire new memories about associations between stimuli. This enhanced learning is observed during classical eyeblink conditioning of both hippocampal-dependent and -independent learning. It can be induced within minutes of the stressful event and persists for days. Here we examined the role of the major stress hormones glucocorticoids in the enhancement of learning after stress. In the first two experiments, it was determined that adrenalectomy (ADX), with and without replacement of basal levels of corticosterone, prevented the stress-induced enhancement of trace conditioning, a task that is dependent on the hippocampus for acquisition. In a third experiment, demedullation, which removes the adrenal medulla but leaves the adrenal cortex and corticosterone levels intact, did not affect the enhancement of learning after stress. In a fourth experiment, ADX prevented the stress-induced enhancement of delay conditioning, a hippocampal-independent task. In a final experiment, it was determined that one injection of stress levels of corticosterone enhanced new learning within minutes but not new learning 24 h later. Together these results suggest that endogenous glucocorticoids are necessary and sufficient for transiently enhancing acquisition of new associative memories and necessary but insufficient for persistently enhancing their acquisition after exposure to an acute stressful experience." @default.
- W2058156961 created "2016-06-24" @default.
- W2058156961 creator A5052037082 @default.
- W2058156961 creator A5057104849 @default.
- W2058156961 date "2003-01-01" @default.
- W2058156961 modified "2023-10-12" @default.
- W2058156961 title "Glucocorticoids are necessary for enhancing the acquisition of associative memories after acute stressful experience" @default.
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- W2058156961 doi "https://doi.org/10.1016/s0018-506x(02)00025-9" @default.
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