Then the researchers took those mice out of the box and put some different mice that had not been exposed to the shocks and put them in that box. The new mice sensed the fear of the other mice, and they too started to scurry around in fear. In China, they found that farm animals such chickens can often sense when an earthquake is about to happen. Many of the animals will act nervous, as if something was about to happen. Doctors used to be able to sense when a person had a serious disease.
Some people say they can sense when others are going to die.
Although researchers had studied effects on plants and animals, not much has been done in this area on humans. One reason is that it is more difficult to be subjective with human tests. That points to an explanation of some of the examples given above. The infected tobacco leaves gave off a chemical odor that the healthy leaves sensed, thus triggering their defensive mechanism. The mice that were in fear gave off odors that stayed in the box and were sensed by the other mice.