"A mirror neuron is a neuron that fires both when an animal acts and when the animal observes the same action performed by another. Thus, the neuron "mirrors" the behavior of the other, as though the observer were itself acting. Such neurons have been directly observed in primate species. Birds have been shown to have imitative resonance behaviors and neurological evidence suggests the presence of some form of mirroring system. In humans, brain activity consistent with that of mirror neurons has been found in the premotor cortex, the supplementary motor area, the primary somatosensory cortex and the inferior parietal cortex."
This is just a brief explanation here of this phenomena. As much as I have discovered, this discovery is in it's preliminary stages. I have extrapolated so far, that there is first a transfer of electrical information between host's before the mirror neurons can fire. Since without a valid connection no reactionary effect will be possible, a mirror neuron can not fire in isolation. This possibly show's so far, that within groups of people, emotional frequencies (States) could be altered by human traffic.
Mirror neuron - Wikipedia
