Endogenous cortisol level interacts with noradrenergic activation in the human amygdala
Anda H van Stegeren1, Oliver T Wolf, Walter Everaerd
1University of Amsterdam, Department of Clinical Psychology and Cognitive Science Center, Roetersstraat 15, 1018 WB Amsterdam, The Netherlands. A.H.vanStegeren@uva.nl
Neurobiology of Learning and Memory
|August 4, 2006
Summary
High cortisol levels amplify amygdala activation in response to emotional stimuli, but only when noradrenaline is available. This finding supports a synergistic stress hormone model in humans.
Area of Science:
- Neuroscience
- Psychology
- Endocrinology
Background:
- Animal studies suggest cortisol influences stress task performance via amygdala modulation.
- Noradrenaline availability in the amygdala is critical for cortisol's effects.
- An animal model highlights the amygdala's role in the noradrenaline-cortisol interaction.
Purpose of the Study:
- To test the human applicability of an animal model on the interaction between cortisol and noradrenaline.
- To investigate the effect of endogenous cortisol levels on amygdala activation during emotional stimuli exposure.
- To determine if cortisol modulates amygdala activation synergistically with noradrenaline in humans.
Main Methods:
- fMRI scans were used to measure amygdala activation in human subjects viewing emotional and neutral pictures.
- Subjects received either propranolol (a beta-adrenergic antagonist) or a placebo.
- Salivary cortisol levels were measured, and subjects were divided into High and Low cortisol groups post hoc.
Main Results:
- Emotional stimuli increased amygdala activation under placebo but not propranolol.
- A significant interaction between cortisol levels and amygdala activation was observed for emotional stimuli under placebo.
- The High cortisol group showed greater amygdala activation to emotional stimuli compared to the Low cortisol group under placebo.
Conclusions:
- The findings extend the rodent-based model of synergistic effects of cortisol and noradrenaline to humans.
- Endogenous cortisol levels significantly interact with noradrenaline to modulate amygdala activation.
- The amygdala plays a crucial role in the interaction between these two key stress hormones in humans.
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