[ursidae]

For a practical example of this, see 'Transcranial Magnetic Stimulation':

http://en.wikipedia.org/wiki/Transcranial_magnetic_stimulati...

[avian]

TMS uses magnetic fields that change with time while the linked article talks about the effect of static magnetic fields.

[jedberg]

While this is true, the point was that weak magnetic fields have an effect on human cognition.