Various acupuncture stimulations were given to a 60 year-old housewife with a distinct meridian phenomenon to observe subsequent PSM. Clear PSM was induced either by finger pressure, press needle or low frequency press needle stimulation of Guanchong (terminal point). Scarless moxibustion applied to a source point induced clearer PSM than that to a terminal point. Comparing the propagating speeds of the PSM induced by press needle stimulations of the terminal points of the twelve meridians, those of liver, kidney and spleeen were the fastest (about 70cm/sec) and those of heart and large intestine were the slowest (1cm/sec). The propagation of PSM was blocked by 50-60mmHg of manchette pressure or by about 400g/cm local pressure using a pressure meter.

The direction of echo sensation of each acupoint was examined on the patients who showed obvious meridian phenomenon.
The heart meridian and large intestine meridian were chosen. Echo sensation propagating both directions, i. e. afferently and efferently, was seen most often, then afferently only and efferent only followed.
The direction of echo sensation did not neccesarilycoincide with that of meridian stream.

The term, propagated sensation along the channels (PSC) means the peculiar sensation expeerienced by some people along thier meridians when given acupunctural stimulation of acupoints.
In the present study, the incidence of PSC in outpatients who were undergoing acupuncture treatment was investigated.
Low frequency electrical stimulation was performed through press needles at twenty-six points: the twelve terminal points of the twelve regular meridians and the Inner-Zhiyin points of both sides. PSC was assessed on a four-grade basis after the manner carried out in China.
The incidence of PSC was significantly high among the outpatients compared with that among healthy youth. Patients with hypertension or posttraumatic neck syndrome showed higher incidence of PSC than the other patients.

In order to investigate the meridian phenomenon elicited by the stimulation on auricular acupuncture point, a patient, 58-year old, in whom marked meridian phenomena are observed on the body was selected as a subject.
The stimuli were ginen by means of a low frequency electrical stick method on the 210 auricular-points of the left ear.
The echo sensation to the remote district from the auriculo-points stimulated was observed in about 30% of the total points.
In 4.3%, the site to which echo sensation reached corresponded to the response organ that is expresed in the name of point. A point named “anesthetic point for tooth extraction” was one of the representatives.
The comfortable feeling over head, eyes, and whole body was also observed when stimulation was given to these points.