This study established a common law for perception by known sensoric ways and for human electromagnetic sensitivity under ultra weak pulsating magnetic fields. Stimuli distinguished by tested persons were ultra a weak magnetic field, and combined magnetic and light stimuli. possible general mechanisms of interactions were shown between external electromagnetic fields used in magnetic therapy and human electromagnetic fields, particularly, as produced by the aorta-carotid-sinus loop. If external fields were close in intensities and directions to ambient human electromagnetic fields, behavior seemed to be like a superposition of them. The effect of resonant mechanical vibrations was detected and it was found that the time to establish resonant mechanical human skin vibrations as a response of tested subjects could be used as new quantitative reproducible charactristic. It depended on the mutual orientation of an external pulsating magnetic field and the aorta-carotid-sinus loop. But the effect did not depend on the intensity of exposed pulsating magnetic fields in range from 0.1 micro Tesla to 100 pico Tesla under the optimal orientation. This new fact could have a practical application for the optimization of magnetotherapy treatment.