INTRODUCTION
Acupuncture
DISEASES
Acupuncture is one of the most commonly used traditional and complementary therapies worldwide for its efficacy in treating many diseases (Bishop et al., During acupuncture manipulation, the sensory information induced by acupuncture stimulation including the local sensation of the patient and the sensation of the acupuncturist's fingers, will be processed and integrated in the central nervous system. In the last two decades, neuroimaging techniques had been widely used to investigate the cerebral responses elicited by acupuncture stimulation. The majority of these studies had focused on the processing of acupuncture signals in the brain of patients, while a few studies concerned on the cerebral feedback of the acupuncturist. Furthermore, almost all the studies investigated the single brain of the patient or the single brain of acupuncturist, and only one study examined the bilateral brain interaction between patient and acupuncturist (Ellingsen et al., Although nearly all neuroimaging techniques can be used for hyperscanning, functional near‐infrared spectroscopy (fNIRS) has been the most widely used hyperscanning modality to monitor the cortical hemodynamics of interpersonal interactions recently (Hamilton, 