Contribution of vision, touch and hearing to the use of sham devices in acupuncture-related studies.

From PubMed via Jisc Publications RouterHistory: received 2019-05-02, revised 2019-08-22, accepted 2019-12-11Publication status: aheadofprintThis study investigates whether visual deprivation influences participants' accuracy in differentiating between real and sham acupuncture needles. It also evaluates the relative contributions of tactile, visual and auditory cues that participants use in their decision-making processes. In addition, a simple sensory decision-making model for research using acupuncture sham devices as comparative controls is proposed. Forty healthy individuals underwent two conditions (blindfolded and sighted) in random sequence. Four sham and four real needles were randomly applied to the participants' lower limb acupoints (ST32 to ST39). Participants responded which needle type was applied. Participants then verbally answered a questionnaire on which sensory cues influenced their decision-making. The proportion of correct judgements, P(C), was calculated to indicate the participants' accuracy of in distinguishing between the needle types. Visual deprivation did not significantly influence the participants' discrimination accuracy. Tactile cues were the dominant sensory modality used in decision-making, followed by visual and auditory cues. Sharp and blunt sensations were associated with the real and sham needles respectively for both conditions. This study confirmed that tactile cues were the main sensory modalities used in participant decision-making during acupuncture administration. Also, short term blindfolding of participants during procedures will unlikely influence blinding effectiveness. CLINICAL TRIAL REGISTRATION NUMBER: Not applicable. This study does not fall under the definition of a clinical trial under the ICMJE guidelines. [Abstract copyright: Copyright © 2019. Published by Elsevier B.V.