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- THE WEEK, Page 25HEALTH & SCIENCEMagnets on the Brain
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- Why some humans have a better sense of direction
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- Scientists have known for years that some animals -- birds,
- fish, insects -- have tiny natural magnets embedded in their
- tissues, crystals of a mineral known as magnetite. The
- suspicion is that magnetite enables these creatures to sense the
- earth's magnetic field, letting them navigate from one place to
- another with what amounts to biological compasses.
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- Now a group of scientists at the California Institute of
- Technology has discovered that magnetite is found in human
- brains as well. That could eventually explain why some people
- have a better sense of direction -- perhaps they have more
- magnetite. The presence of magnetically sensitive crystals in
- the brain could conceivably explain the health problems some
- people claim are caused by electromagnetic fields. Until now,
- no one knew of anything in the body that could be affected by
- these fields. One caveat from a researcher: the magnetic fields
- from high-tension power lines, often cited as prime culprits,
- are not strong enough to affect the crystals his team found --
- though those from some home appliances, like electric blankets,
- may be. Even then, the link is only more plausible than it once
- was, but still a long way from proved.
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