Placebo acupuncture as a form of ritual touch healing: a neurophenomenological model

Placebo acupuncture, where needles rest on the skin without penetrating, can relieve chronic pain, yet the mechanism is unclear. This qualitative study interviewed patients from a randomized trial on irritable bowel syndrome, focusing on their unprompted descriptions of enhanced touch sensations. In five of six cases, patients linked sensations such as warmth and tingling to treatment effectiveness. The authors propose a "neurophenomenological" account of the placebo effect, suggesting that attentional filtering dynamically affects early sensory cortices, potentially explaining the healing response.

Study at a glance

Abstract

Evidence that placebo acupuncture is an effective treatment for chronic pain presents a puzzle: how do placebo needles appearing to patients to penetrate the body, but instead sitting on the skin’s surface in the manner of a tactile stimulus, evoke a healing response? Previous accounts of ritual touch healing in which patients often described enhanced touch sensations (including warmth, tingling or flowing sensations) suggest an embodied healing mechanism. In this qualitative study, we asked a subset of patients in a randomized trial in irritable bowel syndrome to describe treatment experiences. Analysis focused on patients’ unprompted descriptions of any enhanced touch sensations (e.g., warmth, tingling) and any significance patients assigned to the sensations. We found in 5/6 cases, patients associated sensations including “warmth” and “tingling” with treatment efficacy. The conclusion offers a “neurophenomenological” account of the placebo effect by considering dynamic effects of attentional filtering on early sensory cortices, possibly underlying the phenomenology of placebo acupuncture.