Expectations and hope can influence how people experience treatment.
This is clearly seen in the placebo effect, where patients feel better without receiving active medication.
The question is whether there is also a measurable biological explanation.
A new study does not provide a definitive answer, but points to a possible connection.
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Mind and the immune system
A new study, published in Nature Medicine and conducted by researchers from, among others, Yale University, examined whether activity in specific areas of the brain may be linked to the body’s response to vaccines.
According to the study’s lead authors, the research focuses on the interaction between the brain’s reward system and the immune system.
All participants in the experiment received the hepatitis B vaccine. The researchers then measured antibody levels in the blood to assess the immune response.
Training expectations
Some participants were trained using neurofeedback, during which they received feedback on their own brain activity while inside a brain scanner.
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They were encouraged to focus on positive expectations, but not general happiness. Other participants received either a different type of training or no training at all.
According to the researchers, participants who were able to increase activity in a specific reward-related area of the brain were the ones who showed higher antibody levels.
Cautious conclusions
An external immunologist from Harvard University assessed that the study is among the first to demonstrate a link between activity in a specific brain region and immune response.
At the same time, it is emphasized that there were no clear differences between the groups overall.
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The researchers therefore point to uncertainties and limitations.
Nevertheless, the study raises a relevant question: whether expectations can influence the body more directly than has previously been documented.
This could have implications for future research into both vaccinations and treatment effects.
Sources: Scientific American, and Nature Medicine.
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