Placebo Effect Not Linked to Dopamine, Study Finds

A study revealed that the placebo effect is not influenced by dopamine, contradicting previous findings. Researchers from University Hospital Essen conducted experiments on 168 volunteers using different drugs affecting dopamine levels, and found no significant changes in participants' pain relief expectations.

A new study from University Hospital Essen has debunked the theory that dopamine, the brain's 'pleasure' chemical, influences the placebo effect, which is the pain relief experienced during treatment simply by anticipating it.

Contrary to earlier beliefs, researchers discovered no direct impact of dopamine on placebo effects. The study involved 168 healthy participants who were divided into three groups and treated with different drugs that either increased, decreased, or had no effect on dopamine levels.

Despite the varied treatments, changes in dopamine levels did not affect the participants' pain relief expectations during the trials, which included exposure to painful heat. The study's results were published in the journal PLoS Biology.