Arousal-induced modulation of memory storage processes in humans

Neurobiology of Learning and Memory
Kristy A NielsonR A Jensen

Abstract

We recently demonstrated in human subjects that muscle-tension-induced arousal can enhance later retention performance and that this effect is attenuated by beta-adrenergic receptor antagonists. In that study, each subject established a baseline for muscle tension by squeezing a hand dynamometer for 30 s with maximum force. This may have served to "prime" subsequent arousal produced by muscle tension. Two experiments were performed to address this issue. At the beginning of each experiment, young adult subjects were asked to squeeze the hand dynamometer at maximum effort either for 30 s (Prime) or for only 1 s (No prime). Then, during the task, arousal was induced by having each subject exert a moderate amount of tension (25 to 50% of baseline maximum). In the first experiment, subjects were shown four consecutive lists of 20 highly imageable nouns, given immediate recall tests of each, and then given a comprehensive recall and recognition test at the conclusion of the experiment. Moderate arousal was induced once for each list (at encoding, consolidation, or retrieval) or not at all for one list. The sequence of arousal induction was counterbalanced. Significant enhancement of delayed recall was seen in the 30-s group for thos...Continue Reading

Citations

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