Fig. 4

The distribution of three types of neurons and the rate of change for spike frequency change of NTS neurons after minimal acupuncture stimulated at ST 36 and ST 25. The population of three types neuron in NTS at 1 min (a), 3 min (c), 5 min (e), 7 min (g) and 9 min (i) after minimal acupuncture administered. And the rate of change of spike frequency in NTS neurons at 1 min (b), 3 min (d), 5 min (f), 7 min (h) and 9 min (j) after minimal acupuncture administered. Results of the number of three types of neurons are real numbers and the rates of change of spike frequency are mean, quartile and standard deviation. n = 5. mini acu means minimal acupuncture