Dissociable contributions of the amygdala to the immediate and delayed effects of emotional arousal on memory

Learning & Memory
Dirk Schümann, Tobias Sommer

Abstract

Emotional arousal enhances memory encoding and consolidation leading to better immediate and delayed memory. Although the central noradrenergic system and the amygdala play critical roles in both effects of emotional arousal, we have recently shown that these effects are at least partly independent of each other, suggesting distinct underlying neural mechanisms. Here we aim to dissociate the neural substrates of both effects in 70 female participants using an emotional memory paradigm to investigate how neural activity, as measured by fMRI, and a polymorphism in the α2B-noradrenoceptor vary for these effects. To also test whether the immediate and delayed effects of emotional arousal on memory are stable traits, we invited back participants who were a part of a large-scale behavioral memory study ∼3.5 yr ago. We replicated the low correlation of the immediate and delayed emotional enhancement of memory across participants (r = 0.16) and observed, moreover, that only the delayed effect was, to some degree, stable over time (r = 0.23). Bilateral amygdala activity, as well as its coupling with the visual cortex and the fusiform gyrus, was related to the preferential encoding of emotional stimuli, which is consistent with affect-bi...Continue Reading

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Citations

Oct 16, 2019·Memory·Dirk SchümannTobias Sommer
Oct 15, 2019·Annual Review of Psychology·Rebecca M ToddAdam K Anderson
Feb 18, 2021·Learning & Memory·Esther FujiwaraTobias Sommer

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