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Classically conditioned changes of blood glucose level in humans
G Fehm-Wolfsdorf1, M Gnadler, W Kern
1Institut für Psychologie der Universität Kiel, Germany.
Physiology & Behavior
|July 1, 1993
Summary
This study demonstrates that human blood glucose levels can be conditioned using classical conditioning techniques. Repeated association of a neutral stimulus with insulin injections led to conditioned blood glucose changes in some participants.
Area of Science:
- Psychophysiology
- Behavioral Neuroscience
Background:
- Classical conditioning can elicit psychophysiological responses through stimulus association.
- Animal studies show conditioned blood glucose changes, but outcomes vary.
- Human studies on conditioned glucose regulation are less common.
Purpose of the Study:
- To investigate the potential for classical conditioning to alter blood glucose levels in humans.
- To determine if a conditioned response (CR) in blood glucose can be established using insulin as an unconditioned stimulus (US).
Main Methods:
- Thirty male volunteers underwent five experimental sessions.
- Insulin injections (US) were administered, inducing a blood glucose drop (unconditioned response, UR).
- A conditioned stimulus (CS) compound was presented with US in four sessions and with placebo in the fifth.
Main Results:
- Approximately 50% of subjects exhibited a significant blood glucose change (>10 mg/dl) from baseline.
- This change was interpreted as a conditioned response (CR).
- Conditioning was more pronounced when the CS compound was paired with the injection.
Conclusions:
- Classical conditioning can induce changes in human blood glucose levels.
- The experimental environment and associated stimuli may act as effective conditioned stimuli.
- Further research is needed to explore the nuances of conditioned glycemic responses in humans.