Abstract
Rationale
Fear conditioning reliably increases the startle reflex and stress hormones, yet very little is known about the effect of stress hormones on fear-potentiated startle. Cortisol and the sulfate ester of dehydroepiandrosterone (DHEA-S) are involved in stress and anxiety. Evidence suggests that low cortisol/DHEA-S ratio has a buffering effect on stress and anxiety in preclinical and clinical studies, suggesting that there may be a relationship between fear-potentiated startle and cortisol and DHEA-S activity.
Objective
The aim of the study was to examine whether there is a relationship between cortisol/DHEA-S ratio and fear-potentiated startle.
Methods
Thirty healthy subjects participated in a differential aversive conditioning experiment during which one of two stimuli (CS+) was paired with a shock, and the other was not (CS−). Conditioned responses were assessed with the startle reflex, defined as startle potentiation during CS+ compared to CS−. DHEA-S and cortisol levels were assayed from blood samples collected in both a baseline and an aversive conditioning session. Subjective state anxiety, arousal, and valence were assessed at various times during testing.
Results
Fear-potentiated startle was larger in individuals with high compared to low cortisol/DHEA-S ratio. Multiple regression analyses revealed that fear-potentiated startle was positively associated with cortisol and negatively associated with DHEA-S. There was no significant correlation between DHEA-S and cortisol levels.
Conclusion
These data suggest that cortisol and DHEA-S are involved in fear conditioning.
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Acknowledgements
This research was supported by the Intramural Research Program of the National Institute of Mental Health.
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Grillon, C., Pine, D.S., Baas, J.M.P. et al. Cortisol and DHEA-S are associated with startle potentiation during aversive conditioning in humans. Psychopharmacology 186, 434–441 (2006). https://doi.org/10.1007/s00213-005-0124-2
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DOI: https://doi.org/10.1007/s00213-005-0124-2