The aim of this research is to check whether the induction of respiratory frequencies inferior to base line, accounts for the reductions of the electric conductance of the skin (CEP) and whether this occurs both when the times of inspiration and expiration are the same as when the time of induced expiration is superior to the time of induced inspiration. In order to prove this, three groups were organised consisting of 16 subjects each which were subject to three different ratios of inspiration expiration (group 1:Inspiration=X, expiration =X, group 2:Inspiration=Y, espiration=Y+Y/2 and group 3:Inspiration=Z, espiration=2Z). Simultaneously, all subjects were subject to the same respiratory frequencies (6, 10, 14, 18 and 22 cycles per minute). The results of the experiment confirmed our initial hypothesis. It was proved that an meaningful part of the subjects of our sample were obtaining CEP values in those induced frequencies which were inferior to the base line lower than those which were equal o superior to the base line. This happened in all the conditions of inspiration-expiration.