Related Experiment Videos
Classically conditioned changes in plasma cortisol levels induced by dexamethasone in healthy men
M E Sabbioni1, D H Bovbjerg, S Mathew
1Department of Psychiatry, Memorial Sloan-Kettering Cancer Center, Cornell University Medical College, New York, New York 10021, USA.
Summary
Human classical conditioning can alter stress hormone levels. A study showed that pairing a flavored drink with dexamethasone led to conditioned increases in plasma cortisol, demonstrating Pavlovian responses in humans.
Area of Science:
- Neuroendocrinology
- Behavioral Science
Background:
- Animal studies suggest classical conditioning influences the hypothalamic-pituitary-adrenal (HPA) axis.
- Understanding human HPA axis conditioning is crucial for stress response research.
Purpose of the Study:
- To investigate if plasma cortisol levels can be classically conditioned in humans.
- To determine if pairing a distinct beverage with dexamethasone can elicit a conditioned cortisol response.
Main Methods:
- Prospective, randomized, double-blind, placebo-controlled study with 25 healthy men.
- Experimental group received flavored beverage paired with dexamethasone; control group received placebo.
- Plasma cortisol levels measured before and after conditioning and testing phases.
Main Results:
- The experimental group showed significantly higher plasma cortisol levels after conditioned stimuli exposure compared to the control group.
- Conditioned increases in cortisol were observed after pairing a flavored beverage with dexamethasone.
- No cortisol differences were found on a separate comparison day without the conditioned stimuli.
Conclusions:
- Plasma cortisol levels can be classically conditioned in humans.
- Pavlovian conditioning procedures can alter human neuroendocrine responses, specifically the HPA axis.
- This study provides evidence for conditioned HPA axis activity in humans.