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| Relationship
between currents in the brain and the |
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| magnetic
field outside the head. |
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| Based on the
discovery |
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| that
electrical currents |
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| generate
magnetic fields: |
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| Hans Christian
Oersted, |
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| a Danish
physicist (early |
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| 19th. century) |
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| A current
source with |
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| strength Q
causes a |
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| current flow
Jv within |
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| the brain. |
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| B |
| V |
| Q |
| Jv |
| Columbia fMRI |