A nose for danger
In my family it's well known that my dad has a great "sniffer." He detests perfume so, of course, when I was in high school I wanted to wear perfume terribly! I remember buying some with a subtle scent, then putting on the tiniest bit imaginable while I was up in my bedroom. My father, from downstairs, shouted up to me to "wipe that stuff off!" It was amazing. While I don't think many people have a sense of smell quite as attuned as my dad's, it turns out that most of us can be trained to sense danger through our sense of smell. Scientists have determined that the human sense of smell can be trained to detect even subtle changes in smells associated with danger. Study volunteers were exposed to two grassy odors and none could differentiate between the smells. The volunteers were then given a mild shock during one of of the smells; after being given the shock they were all able to tell the difference between the two odors. MRI brain scans taken before and after shocks were administered showed a change in the olfactory cortex after the shocks.
It's official... the nose knows!
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