Personality Differences of Brain Networks in Placebo Analgesia and Nocebo Hyperalgesia: A Psychophysiological Interaction (PPI) Approach in fMRI

It is generally believed that the placebo response can elicit an analgesic effect, whilst the nocebo response can elicit a hyperalgesia effect in pain. Placebo analgesia and nocebo hyperalgesia effects are increasing concerns for researchers. Growing evidence suggests personality differences have an...

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Bibliographic Details
Published in:Journal of neural transplantation & plasticity 2020-10, Vol.2020 (2020), p.1-13
Main Authors: Wu, Wen, Cai, Guiyuan, Zeng, Yanyan, Wang, Yaping, Zhan, Hongrui, Huang, Shimin, Shi, Yu, Yang, Jianming
Format: Article
Language:English
Subjects:
Adult
Analgesia
Analgesia - psychology
Analgesics
Brain - physiology
Brain Mapping
Dopamine
Humans
Hyperalgesia
Magnetic Resonance Imaging
Medical imaging
Neural Pathways - physiology
Nocebo Effect
Pain
Pain Measurement
Personality
Personality - physiology
Personality traits
Placebo Effect
Psychophysics
Signal transduction
Young Adult
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Summary:It is generally believed that the placebo response can elicit an analgesic effect, whilst the nocebo response can elicit a hyperalgesia effect in pain. Placebo analgesia and nocebo hyperalgesia effects are increasing concerns for researchers. Growing evidence suggests personality differences have an impact on both placebo and nocebo effects. However, previous studies have not reached a unified conclusion. We designed this study to explore the personality differences of functional magnetic resonance imaging (fMRI) signals in placebo response and nocebo response by using psychophysiological interaction (PPI) analysis. 30 healthy subjects underwent conditioning induction training to establish expectations of placebo effect and nocebo effect, and then, all subjects completed the following experimental procedures: (1) baseline scanning, (2) acute pain model establishment, (3) pain status scanning, and (4) pseudorandom scanning of block design of placebo response or nocebo response. Behavioral data were collected after each scan. The results of this study showed that (1) there were significant differences of VAS placebo intervention between the extrovert group and the introvert group (p=0.004); (2) there were significant differences of VAS nocebo intervention between the extrovert group and the introvert group (p=0.011); (3) there were significant differences between the VAS placebo intervention and VAS pain status (baseline) in both the extrovert group (p
ISSN:2090-5904
0792-8483
1687-5443
1687-5443
DOI:10.1155/2020/8820443