[Neuroscience] Re: Explaination of the direction of field potentials

Matthew Kirkcaldie m.kirkcaldie at removethis.unsw.edu.au
Wed Jun 7 08:05:49 EST 2006

It's positive ions entering the cell.  If you're near the dendrite, but 
not in it, since dendrites are tiny, the charges are leaving the 
electrode region to enter the dendrite, so the electrode region is 
negative. If you're in the soma, the ions are entering the region around 
the electrode, so it looks positive.

However I would love someone with a better answer to chime in.


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