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Classically conditioned modulation of pain depends on stimulus intensity
Daniel S Harvie1,2,3, Eva Y Poolman1,2,4, Victoria J Madden5
1School of Health Sciences and Social Work, Griffith University, Brisbane and Gold Coast, Australia.
Experimental Brain Research
|February 11, 2022
Summary
Pain-associated cues can increase pain sensitivity, a phenomenon known as classically conditioned hyperalgesia. This study found that cue-induced hyperalgesia primarily affects more intense stimuli, suggesting stimulus intensity is a key factor.
Area of Science:
- Neuroscience
- Psychology
- Pain Research
Background:
- Innocuous environmental cues can become associated with pain, leading to enhanced pain perception.
- This phenomenon, known as classically conditioned hyperalgesia, demonstrates the brain's ability to anticipate and amplify pain.
- The magnitude of conditioned hyperalgesia can be influenced by various factors, necessitating further investigation.
Purpose of the Study:
- To investigate whether the sensitizing effect of pain-associated cues is dependent on the intensity of the test stimulus.
- To explore the role of stimulus intensity in classically conditioned hyperalgesia.
Main Methods:
- Two virtual reality environments were paired with either painful or non-painful vibrotactile stimuli.
- Participants rated the intensity of electrocutaneous stimuli at three different levels, presented within these environments.
- Data from 30 healthy participants who experienced sufficient pain during learning were analyzed.
Main Results:
- A significant effect of the environment on pain ratings was observed (p=0.014).
- A significant interaction between environment and test stimulus intensity was found (p=0.046).
- Classically conditioned hyperalgesia was evident only for the most intense test stimulus, indicating a modulation by stimulus intensity.
Conclusions:
- Pain-associated cues can induce hyperalgesia, but this effect is influenced by the intensity of the test stimulus.
- The findings highlight the importance of considering stimulus intensity during and after a painful experience when studying conditioned hyperalgesia.
- Further research is required to fully elucidate the variables governing classically conditioned hyperalgesia.
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