How might dopamine activity in the ventral striatum contribute to placebo pain relief?

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How does the human body perceive and respond to pain? — pain Learn how the human body senses pain and reacts to it.

The placebo effect is a complex psychophysiological phenomenon where an individual experiences improvement after receiving an inert treatment, often driven by their expectations of benefit.1

Research identifies the release of the neurotransmitter dopamine in the ventral striatum as a critical mechanism underlying these expectations. In studies involving patients with chronic conditions, such as Parkinson disease, the anticipation of therapeutic relief triggers dopamine activity in this brain region.1

Specifically, the degree of dopamine release in the ventral striatum appears to be modulated by the level of expectation or uncertainty communicated to the patient. For instance, research has shown that patients told they had a 75 percent chance of receiving an active drug—even when the treatment was actually a placebo—produced significantly higher levels of dopamine in the ventral striatum compared to those given different probability estimates. This suggests that dopamine activity in the ventral striatum serves as a biological mediator that translates psychological expectations into measurable physiological relief, effectively influencing how an individual perceives and tolerates pain.1